Hello and happy new year!

A woman wanted children. She found her daughter who was adopted by a wealthy couple. She met the adoptive parents of her daughter but she does not confess to her daughter that she is his true mother. She became religious and sing at the wedding of his daughter "Ave Maria" in the church...

Thank you for your help!

A movie of 40's/50's/60's... I do not know the nationality of movie.

Answer found: Ave Maria (1953, Germany) by Alfred Braun with Zarah Leander