Yes. I do. People get absorbed in their lives, and focus on what's in front of them that's important to them. I don't say that as a judgment, but as an observation of human behavior. But, given the end was loud and dramatic one would think before she reached that point something she was doing would break through to the notice of others.
I should amend, her mother did notice some things, but not everyone is equipped to confront mental illnesses.