Till There Was You 2003 on netflix

Joanna meets single father Albert and his baby Pippa on a bus. When she gets off the bus, Joanna accidentally leaves her photograph behind with her book. Over the years, Pippa comes to believe that this picture is of her mother’s. Years later, Pippa meets Joanna again, and Albert hires her to act as Pippa’s mother. Eventually, Albert and Joanna become romantically involved.