While still in high school, Steigerwalt made her film debut playing the main female role in Gabriele Muccino's But Forever in My Mind, and later appeared in Muccino's The Last Kiss.[2] After making her English-speaking debut in Audrey Wells' comedy-drama Under the Tuscan Sun and appearing in some other films, notably Volfango De Biasi's teen comedies Come tu mi vuoi and Iago, starting from 2012 Steigerwalt focused on screenwriting, taking various courses and getting a certificate in Feature Film Writing from UCLA.[2]