I don't even know where to start with this. It's another baffling Netflix movie in that you have such a bad movie with such a good cast. I feel that there was too much of an attempt to try to make the movie more serious than it needed to be instead of letting it fulfill its fun alien-horror-b-movie campfest potential.
If you want this movie to make sense, find one of the many articles that explain the ending and premise because that was the only way I knew what was going on. I'm kind of bummed because this was so close to being so bad that it's good. Also, it turns out she's smiling at the end. I thought she was screaming. The more you know...
