there's plenty of "functional" alcoholics, or "functional" depressives. That doesnt negate their struggle whatsoever. The mental illness(es) are still present.

Now it is possible that her coo-coo bananas behavior is a ploy to get your attention, however, that wouldnt make the situation any better. She'd still be deranged and self-harming. She's so not okay even if she's able to mask in certain situations.

Now, thats not to say that her blatant disregard for your boundaries is okay. Its in fact very NOT okay. When you end things, do it very clearly, be clear that you want no contact going forwards. Then block her on everything. The very first time she finds a way to circumvent that, tell her in message form to stop or you will call the police for harassment. The second time she contacts you, follow through with doing so.