As others have posted, think you might want to let this one go.... It sounds cold, but this may force her to confront how she cares for herself, and have to hold herself more accountable for relationships.

Unfortunately, it might take years for people to accept the fact that they have an illness, that it is serious, and they will have to live a little more consciously than people without mental illness.

What I mean by "consciously" is that it is up to them to learn and then be aware of their unique early-warning signals.. They will have to ensure they are getting proper sleep, avoid triggers and unhealthy behavior, and build skills to maintain psychological homeostasis.

Even then, this is no guarantee one won't hit depression/mania, but it could lessen the fallout.

I've found it's okay to lean on others for support, but not to get up on their backs, asking them to carry me. She needs to learn how to do her own heavy-lifting.

Wishing the best for you, which ever choice you should make. Take care