After separation and engagement in September 2017, Fiedler has been living in a relationship with TV producer and sports official Otto Steiner, with whom she has been married since 9 January 2019, since October 2017.
She made her film debut in 1998 in the short film Zita - Tales of Deadly Sins, which won the special jury prize at the International New Film Festival in Turin.
On the advice of her agent, she changed her family name to Toma, the first name of her great-grandfather, in order to have a name that was easier to pronounce in Germany and to get better acting roles.