(this should be "spoiler" hidden)
Yes. I would have love to have seen the movie where either (a) of course she wasn't an alien and we were telling a tragic story about delusion brought on by trauma, or (b) she was an alien and that was actually treated kinda seriously, in an "X-files" kinda way.
Instead, nope, it's all a joke and you (the audience) are stupid for caring about any of this. Boo. π΅