You know, just skimmed through some of your old threads and saw the part about schizophrenia in W's family. And several times that she has admitted being paranoid (of course, that could have just been guilt talking).
Raises the question, is she a typical WAS or is she mentally ill? It can be surprisingly hard to tell the difference sometimes, as most WASs are suffering from some type of depression. Still, your W's behavior seems over-the-top with breaking down the door. Does she have any physical ailments? (Some things, like thyroid problems, B12 deficiency, etc. etc. can sometimes cause mental symptoms that can be mistaken for bipolar disorder or psychosis). Do any of these physical ailments run in her family? Does she have any other psych symptoms?