You mentioned that "they" have changed her medications. I hope "they" includes a psychiatrist because that is the only type of doctor that should be administering her medication adjustments.
You need to let them know what is happening with her. We bipolars when going through an episode like this are not capable of seeing the whole picture. Someone needs to go with her to the doctor and explain the depths of what she is going through. She really needs a medication adjustment asap. So contact them immediately. Let them know all of what you are describing here.
Hopefully she has mentioned to you about being bipolar. This type of behavior is very typical when bipolars need a medication adjustment or stop taking their medications.
You need to speak with her during a calm time and let her know that this is all new to you but that you will not tolerate any of the abuse that you talked about! You need to get really informed about bipolar disorder and find out if you are ready to committ yourself to this relationship that will need a lot of support from you. She too needs to make the committment as well to be proactive in her wellness by being upfront with the doctors and seeing a therapist who can help her get a handle on her behavior. That takes committment and work from her.
Hope all goes well. Keep us posted.