Thalmann started her career at the age of nine with
FC Bulle on a boys' team coached by her father. She played forward at this time and later switched to goalkeeper at age 14, when she advanced to the women's team FC Riaz. Two years later she joined FC Vétroz in Nationalliga B, the second highest tier of football in Switzerland. Her first senior camp was FC Rot-Schwarz Thun, where she suffered a serious
anterior cruciate ligament injury. After one year, she switched to
FFC Zuchwil 05, with whom she became vice-champion and league cup winner in 2006. This was followed by a move to
FC Luzern Frauen. After a trial at
1. FFC Turbine Potsdam, she signed a contract there on 8 January 2008 until 30 June 2009, joining the
Bundesliga, the top league of football in Germany. Her first Bundesliga game was completed on 24 February 2008 in an away game against
Hamburger SV. In 2009 she won with her team the
DFB indoor cup and the
German Championship. For the 2009/10 season she moved to Hamburger SV. In 2010 she returned to Switzerland, with
Grasshopper. She played with
1. FC Lokomotive Leipzig, and then joined top level Italian
Serie A club
ASD Torres. In the summer of 2014 she moved to
MSV Duisburg. After MSV Duisburg's relegation to the second division, Thalmann returned to Switzerland and signed for
FC Basel. In 2016 she moved to the Italian league for
A.S.D. Bardolino Verona C.F. In the summer of 2019 she left Italy to return to Switzerland, to
Servette Chênois. She played at Servette Chênois for two seasons, before moving to
Real Betis in Spain in July 2021. Following the
2023 FIFA Women's World Cup, Thalmann retired from football. == International career ==