Partner's IUD ran out, refuses to have it removed, or get a new one

My partner, who is 35, is Schizoeffective, late last year, after trying multiple combos of different medicines we found one that was seemingly effective without significant side effects(Caplyta, Lamictal, Desvenlafaxine). Since she was 20, it was advised that she be on a hormonal IUD, due to heavy flow and significant mood swings that affected the effectiveness of her meds. Earlier this year, after a period of monthly mood swings, her bleeding started again, and its been about 5 years, which corresponds to the amount of time her IUD is effective for reducing the symptoms of PMS.

She has always had tendencies at prioritizing, "Natural" life choices, organic foods, hollistic medicine, numerous things like this, which occasionally caused her to go off meds, or in situations where her meds would be interrupted by a shifty Psychiatrist, stay off of the meds she stopped getting. In this case, there has been a vicious cycle in which her drastic mood swings would cause her to decide she would be going natural like a "Normal Woman", and that my occasional pleas that she go to a doctor to try to get some official word or advice from a medical professional evoke vicious resistance. She is fixated at the moment on the idea that she is in Perimenopause, and that she needs to have all of her hormones. She has not been able to tell me why she thinks this, what her sources are, just that I should ask my female friends about it. In the mean time, when I resign myself to the fact that this is just how it is now, when her PMS hits, it is cataclysmic and awful. I am really in a pickle here about what to do, I'm not sure that there's anything I can do here. Any advice, or just supportive words are welcome.