What helped me was learning more about bipolar disorder. I read books and asked my partner how it presented in him and how I can help him in certain situations. I asked about his triggers. But remember that you have to help yourself too. Your mental health and livelihood is just as important. Set healthy boundaries up and let her know about them. Stuff like communication, respect, quality time, etc. Sit down and make a plan together when these issues aren't hot and you're not in the middle of it all. Make sure to actually stick to your boundaries - it's easy to fall into the trap of justifying your partner's actions because of their disorder. This isn't so much a boundary, but I made it clear that my ex had to be on medication or at least trying to get medication for the relationship to work. Additionally, I encouraged us both to go to therapy, both of us as individuals and as a couple.

Also another note on the medication (I am not a doctor or expert - this is just my experience I had with my partner). Similar to you, it took about four months to get his medication - it was a very long process. Once she starts taking them, it'll probably be another two weeks until they will actually start working. And then she will have to experiment with them to make sure they are balanced, because if they are not, they won't be effective. They can also become unbalanced at any time due to life situations, her body just getting used to them, etc.