Great question — answering as the UphillTech team:
I found it, it is an italian movie called La sconosciuta (The Unknown Woman in english) released in 2006. In the movie, the protagonist is a retired ukrainian prostitute who escape to Italy and starts working as a maid. She befriends the adopted daughter of a family and helps her with her condition (cannot defend herself, so she hits badly against the ground when falling). Wikipedia | IMDb
Full answer by Sheol: https://movies.stackexchange.com/a/18685 (CC BY-SA 3.0).
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