You’re setting yourself on fire to keep her warm. You both agree she needs help, which is great, but she’s doing nothing beyond that, which is not great. On top of that, I’m seeing a lot of manipulation. She accuses you of trying to manipulate her into feeling guilty, which is literally what she is doing to you. This is not a healthy relationship; a good partnership will build both parties up. She needs to work on herself, alone, before you continue any sort of relationship with her. You need an exit strategy before she affects your health any further.
That’s fascinating. I know about the English etymology, which comes from “cuckoo” because a number of species are nest parasites. Do you have any sources? I love etymological history.