Police say they expect to charge a 56-year-old man with attempted murder.
Montreal police spokesperson Const. Danny Richer says they believe the woman was struck repeatedly—possibly with a hammer.
"She was injured to her head but her life is not in danger," said Richer.
The attack happened in an apartment near the intersection of Côte-Vertu and Duguay street.
Richer says police are now trying to determine the link between the suspect and the victim.