What difference does it make? "A rose by any other name would smell as sweet." (Crap by any other name would stink as bad.) Clearly, what you describe is crappy behavior. Whatever else she might be, she's obviously immature and likes to take offence where none is intended.

Leave the diagnosing to diagnosticians. Ask yourself if the good days make it worth your while to put up with the bad days. Ask yourself how you could most effectively respond to her being unreasonable.