Honestly? Sounds more like borderline than bipolar.

Everything has revolved around relationship drama. Not mania, not depression, just game playing and bad behavior. On again, off again, talk of pre-emptive breakup (before she "destroys" you), suicidal threat/gesture (which started with her calling you at work, distraught, "line goes dead", you worry, leave work... This would not be unusual as a borderline "test". I've been on the receiving end of this very thing.) You seem to repeatedly "save" her from herself. You rescued her, she got a bit of sleep and was all better. Just like that. Huh. She is "always better when she is with" you. See object permanence in BPD. It's tied in with the lack of sense of self and abandonment issues.

It's hard not to notice that meds only get mentioned when there is bad behavior. Whenever bad behavior happens it's "because she's off her meds". Are you sure? Because it kind of sounds like a pretext for getting you to excuse bad behavior. It works out very well for her that you hold her blameless for anything bad she does, everything coming down to she can't help it so you never get upset with her "outbursts" (see the paragraph 4 free ticket.)

I don't say any of this to he mean. But I do think you are in denial about how she is taking advantage of your caring nature. And that's got NOTHING to do with bipolar.

Even if you set all diagnostic considerations aside, why would you WANT to pursue this?? This is a parent-child dynamic. Is that what you want? If you think you do, think again. It gets old always having to be the grown up. What about what YOU need?

Bottom line: I'm skeptical. Calling it bipolar is a red herring for what's really going on here, imo.

Sorry. I'm just not buying her bill of goods.