I was at a pub some time ago watching the TV while nursing beer. The sound was turned off, but I could still tell it was French.
A human-like alien(?) woman is hosted by an Earth family. This might have been in Montreal, but I can't say for sure. Based on the technology, this would be taking place some time in the future - humans had flying saucers for instance. The woman has telekinetic powers, and I recall one scene where she uses them to freeze a watermelon in mid-air after one of her hosts jokingly tosses it at her.
For reasons I could not figure out, they travel into space, and I seem to recall she has some problems, perhaps flashbacks, during the voyage. They approach and explore an abandoned/destroyed spacecraft. I believe she either was on that ship or others of her race were. I left at this point, perhaps half way into it.
Based solely on the set decoration and the 2001-like "perfection" of the future where everything is clean and tidy, I would place this movie some time in the mid/late 1970s, early 80s at the latest. The spaceships were all "classic flying saucers" as well, which seems to place it in the pre-Star Wars era.
Another notable feature was that all the space scenes were filmed in a water tank. You could see bubbles here and there but they did a pretty good job of it overall.
Given the sets and quality of the filming and editing, I would say that this was a fairly high-budget effort. This was especially true for the spaceships, which were large sets and well decorated. And anything in a water tank costs bucks. Given that I was seeing it in Toronto, I suspect this was a well known movie at the time.