His Daughter Is Peter (1955)

Engineer Max Klaar raises his tomboy daughter Elisabeth (nicknamed Peter) alone. Nora Christian, a famous actress and Max's ex-wife, resurfaces in the village where father and daughter live. Elisabeth coming across her mother takes her to Max's house. Shortly afterward, Elisabeth nearly drowns herself in the village lake but is saved at the last minute by Helga, a student vacationing in the area. The latter is not immune to the charms of Max but Nora puts an end to the fledgling romance by going away and taking Elisabeth with her. Max is at a loss... but not for long. Elisabeth soon realizes she needs her two parents and manages to reunite them in the end.