If they had to cut a hole to take her out of the water tank, how did she get inside in the first place?
Very very strange... and the similarities with black water movie and the tuberculosis outbreak just makes it even stranger!!
For you to have an idea, the name of the tuberculosis test is Lam-Elisa; the girl dead, Elisa-Lam. Just after she vanishes, the tuberculosis outbreak starts around the hotel... makes one think about it.