Regarded as one of the most prominent mezzo-sopranos of her generation.
She graduated from the Music Academy in Wroclaw, Poland, at Barbara Ewa Werner’s class.
In 1996-2007 period she was a soloist with the Wrocław Opera, where she performed many significant roles on opera stage.
She, inter alia, took part in the premiere of “Gioconda” by A. Ponchielli, staged on the river Odra in Wroclaw, and recorded by Polish Television in 2003, performing a part of Laura. She also participated in the recording made for  DUX recording company, where she sang the part of Aza in opera “Manru” by I. J. Paderewski. This recording received an award from Polish Phonographic Academy: FRYDERYK 2004 in category: “The most outstanding recording of Polish music”.

Since 2007 until now she has been solely a free-lance artist. For many years she specialised in performing activities (oratorio and cantata works). Her repertoire includes over 80 works of this genre, ranging from works by J.S. Bach to compositions by  K. Penderecki.

She gave concerts in philharmonic halls in Poland and  all over Europe (Germany, the Netherlands, France, Italy, Ukraine, Lithuania, Austria, Latvia, Russia, Slovenia, Spain)). She took part in international music festivals, such as: Ludwig van Beethoven Easter Festival; “Wratislavia Cantans”; Chopin Festival in Duszniki-Zdroj, Poland; International Encounters East – West in  Zielona Góra, Poland; Baltic Countries Festival in Toruń, Poland; Usedomer Music Festival in Peenemunde, Germany; Festival Pablo Casals in Prades; Festival Casals de Puerto Rico; sacred music festivals in Marseille and Nuremberg; George Enescu International Festival;Rheingau Music Festival; Schleswig-Holstein Music Festival; International Music Festival “Contrasts” in Lvov, Ukraine; Prazske Jaro; Bregenz Festival; Beijing Music Festival; Cafe Budapest Contemporary Arts Festival.

She gave concerts with following conductors: Jiří Bělohlávek, Gabriel Chmura, Lawrence Foster, Gustavo Dudamel, Leopold Hager, Patrick Summers, Sir Andrew Davis, Jacek Kaspszyk, Kazimierz Kord, Bramwell Tovey, Antoni Wit, Jerzy Maksymiuk, Long Yu, Andriy Yurkevych, Gaetano d'Espinosa, Gianandrea Noseda, Valery Gergiev, Noam Sheriff, Vladimir Jurowski; accompanied by, in. al., Polish National Philharmonic Orchestra, Polish Radio National Symphony Orchestra, Sinfonia Varsovia, , NDR Symphony Orchestra, China Philharmonic Orchestra, Orquesta Sinfónica de la Juventud Venezolana Simón Bolivar, Luxemburg Philharmonic Orchestra, BBC Symphony Orchestra, Israel Symphony Orchestra Rishon Lezion, London Symphony Orchestra.

In the years 1999 – 2017 she co-operated with Maestro Krzysztof Penderecki, participating in numerous concerts conducted by Maestro and by other conductors, performing such works as: “Polish Requiem”, “Te Deum”, “Credo”, “Seven Gates of Jerusalem”, „Utrenja”. She took part in a world premiere of Maestro Penderecki’s 8th Symphony “Lieder der Vergänglichkeit” (“Songs of Evanescence”). In September, 2005, she also recorded “Te Deum”, “Lieder der Vergänglichkeit” in 2006, and in 2008: “Utrenja”.

Recordings, in which she participated, received awards: from  Academie du Disque Lyrique “Golden Orpheus Arturo Toscanini ” and from Polish Phonographic Academy “Fryderyk”. In 2014 she participated in a world premiere of  “Dies Illa” by K.Penderecki, a work being a part of a project named “Thousand voices for peace”. She recorded that work in the following year  for an album “Penderecki conducts Penderecki", which was awarded  GRAMMY Award 2017 in the category of choir music.

Recent years, beside important interpretations of oratorio music, were also very successful for her in opera. She took part in the first ever stage production of opera "Passenger" by M. Weinberg in Bregenz,  under direction of David Poutney. She also sang in Mariyskiy Theatre in Sankt Petersburg, Russia, in a guest ballet spectacle "Chopin", performed by Great Theatre - National Opera in Warsaw.

Her outstanding roles in premiere shows in Great Theatre - National Opera (TWON), such as: Mafio Orsini in "Lucrezia Borgia" by G. Donizetti, Lisa in "Passenger" by M. Weinberg;    “Wesendonck Lieder" by R. Wagner, with lyrics by Mathilde Wesendonck, during premiere of a ballet show Tristan"; roles of Hagar in “Moby Dick” by E. Knapik, Marta in “Iolanta" by P. Tschaikovsky and Fenena in “Nabucco” by G. Verdi, were highly appreciated by the audience and the critics.

In 2012 she made her debut In Cracow Opera in a part of Composer in "Ariadne auf Naxos" by R. Strauss and in 2013 in two roles: as Orpheus in “Orpheus and Eurydice” by Ch. W. Gluck and as Azucena in “The Troubadour” by G. Verdi. In  2014 she made her debut in  Houston Grand Opera and in New York, during Lincoln Center Festival in opera "Passenger" by M. Weinberg. Year 2015 brought her debut in Lyric Opera of Chicago and a recital  in Teatro Municipal de Las Condes in Santiago de Chile. In 2015 she also made her debut in part of Carmen in "Carmen" by G. Bizet in OIFP (Opera and Philharmonics of Podlasie in Bialystok, Poland), where she successfully sang in numerous shows. In January, 2016 she made a new stage debut as  Amneris in “Aida” by G. Verdi in Estonian National Opera in Tallin, receiving very good reviews  in the “Opernwelt” magazine.

In current year of  2017, she made another debut with Maestra Edita Gruberova in opera “Norma” by V. Bellini, staged in TWON in Warsaw , singing the part of  Adalgisa. This year she also made her stage debut in Zurich Opera House in opera “The Fiery Angel” by S. Prokofiev and she took part in Festspiele 2017 in Erfurt as Azucena in “Troubadour” by G. Verdi, receiving outstanding reviews. Also in 2017 she made her debut in the role of Anna in  "Les Troyensby H. Berlioz, in Semperoper in Dresden and with the Stuttgart Philharmonic under the baton of Noam Zur.

Since 2003 Ms. Rehlis has been under constant vocal coaching by  Maestro Dariusz Grabowski.