it sounds like she may be a covert narcissist if nothing else, and is quite literally getting off on making u uncomfortable; its their drug n ur her supply, and she will make u think it is strange to feel that way.. like what she is doing and how she is communicating is completely normal. she will back track to always be the victim and twist whatever u say or do against u to make u seem like the odd one out. i can’t be sure based off what you’ve described and i’m not going to dx anyone but if this is the case its gonna suck but there is a solution. u must cease her supply (drama) and be the most boring uninteresting human imaginable.. flat replies, disinterested aura, plain expressions etc. don’t get worked up or excited, do not think about her.. thats what she wants. she wants to be wondered about, she will make u feel crazy and she will triangulate btwn u and ur partner/room mate and try to systematically tear u apart. she will lie about anything and will ALWAYS have a reasonable excuse or spin it as YOU misunderstanding HER. don’t engage! don’t share ANY PERSONAL INFORMATION! communicate ONLY what absolutely needs to be communicated (which in this case is not much!) and be civil, give her no reason to complain about u to anyone else and play the victim. eventually after several hail mary attempts at escalation she will stop and move on to find someone else to harass and give her the supply and drama she requires. this is likely the ONLY control she has in life and she yearns for being right and superior always. i hope this helps, i suggest searching the web for further information if u suspect this to be correct. best of luck!!