Mehlmann started her professional career in Győri ETO KC, and first got into the spotlight when she proved her prolific goalscoring skills and led the Hungarian junior national team to win the silver medal on the 2001 Junior World Championship.

In 2008, when it was made official that Mehlmann is in delicate condition, the sides terminated the contract with immediate effect.

[2] Mehlmann resumed training in early 2010 and joined Hungarian second division team VKLSE Győr.

In August 2011, still under contract with Veszprém, Mehlmann travelled to Ljlubljana with the permission of her club to participate on a trial by RK Krim Ljubljana.

[4] She impressed the Slovenian club's staff who offered her a one-year contract, which Mehlmann accepted and moved to Krim on 16 August 2011.