@PettyPatti, thank you so much for your reply.
We are not in contact at the moment, so I can't really do or suggest anything.
The situation is this: she started to talk with a new psychiatrist in June (the one she had before prescribed her anti-depressants) and this guy told her she is fine and she doesn't need meds, just psychotherapy. He didn't provide a clear explanation for her mood swings, her depression, her past suicide thoughts, her anxiety, agitation, irritability and so on.
When I saw her, she was a mess and I felt something was wrong, I was worried sick and I decided to talk to a mood disorder expert. He asked me many questions and he said she has bipolar II and she needs to take a mood stabilizer as soon as possible as from what he heard from me, the symptoms are pretty serious and are ruining her life. She agreed to talk to him, but then she refused to take the meds he gave her and she said she is fine and she just needs psychotherapy.
I tried gently to convince her this wasn't the right call and she should have at least talked with another psychiatrist if she didn't trust the one I found. She refused. The last updated I had from her was that in September her mood was very low, then it improved a little in October, but still she doesn't feel stable and said something like "I can tell you I am okay now, but I don't know how I will feel tomorrow or next week". I tried to tell her that's a red flag something is off, but she won't listen. Also she told me she has obsessive thoughts she can't stop about her life and bout her relationship with me.