Sounds like you didn't get the ending as it was quite clear. She was an alien, and her "alien essence" was taking over the closer it was to the date of departure, which she knew in advance. She wanted to spend her last few days with her husband, hence going back there, but eventually she had to give in and revert back to her "true self" which was part of the reason why she was having a hard time holding onto her human memories. This is also why she drowns her husband, because at this point she doesn't seem to be fully human, nor remember how human anatomy works, to realize that you can't just throw a person in the water to survive. Another interpretation is that she just wanted to save his "shell" which may have been destroyed/disintegrated by the other aliens, and so she threw him in the lake like a dog might bury a bone in the backyard.
Anyway, there is some ambiguity and room for interpretation in a lot of places, but it's pretty solidly explained she's an alien and that's ultimately what was wrong with her, so there wasn't any ambiguity as far as that's concerned.
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