Question: who played the girl in my two dads?
Answer: Staci Keanan

Staci Keanan (born Anastasia Love Sagorsky on June 6, 1975) is a former American actress and attorney.  Keanan is best known for her roles in the television series My Two Dads (1987-1990) and Step by Step (1991-1998). She has also been credited as Stacy Keenan and Staci Love.