Lehmann was an alternate on the 8th place Swiss team at the 2012 World Junior Curling Championships, though she didn't play in any games.

Later that year she won a gold medal at the 2012 World Mixed Doubles Curling Championship with Martin Rios.

The team would play in two Grand Slam events, the 2012 Colonial Square Ladies Classic and the 2012 ROGERS Masters of Curling.

The team also played in two Grand Slam events, making the quarter finals at the 2014 Masters of Curling and missing the playoffs by one game at the 2014 Colonial Square Ladies Classic.

After the team didn't win the Swiss Championship in 2018, the Pätz rink disbanded as Lehmann and teammates Marisa Winkelhausen and Nicole Schwägli wanted to step back from competitive curling.