Heya Wil Regal (1965)

Sania is a young maid. She pays what she earns to her lover, the student Moneim, so that he can complete his education, but he abandons her. This shocks Sania and she moves to serve a rich family, whose affairs are taken over by a widow with three daughters. They make Sania impersonate one of them to take revenge on a young man, and events turn upside down.