You talk as though I have any control over her whatsoever. She is pretty much uncontrollable. If I tried to suggest she needs to see a psychiatrist it would pretty much ensure she would never see one.. I am pretty much at the end of my tether now.
My ex was on the line of bipolar disorder and schizophrenia. I both didn't have control over anything he did, yet had some things I could do.
First off, good advice is found in the mental health hotlines. 1-800-950-NAMI (6264) if you are in the states. They can let you know options that I might not realize.
I was lucky enough that my ex kept his meds up (mostly) and went to the doctor - and that I had an invitation from his psychiatrist to call the hospital if I had any issues. Unfortunately, you don't have this. However, this doesn't preclude you from talking to her doctor. Even if he or she doesn't give you feedback information. He might be willing to change course with her or offer.
You might be able to change tactics and talk to her as well, explaining that you aren't sure this med is doing well for her and about the changes you have seen. She might be willing to go to a psychiatrist with you under the view of saving the relationship.
You also might be able to speak to a psychiatrist or therapist yourself to get some ideas on how to get through to her.
And good luck to you both. I truly understand your sort of struggle, even if I don't understand the specific flavor of it.