So right now you have broken off with her completely?

Here are some possibilities for thinking about what she is doing.

You have already seen her as emotionally manipulative. In addition, you could look into emotional blackmail, which occurs when someone causes emotional pain if you don't do what they want.

Another possibility is to think of her as an abuser and read about the cycle of abuse. Abusers typically have periods of kindness before returning to abuse.

You could consider being more assertive. You might flatly say, for example, I can't help you. You would say this in a civil but firm manner, and repeat civilly and firmly as needed.

If she receives no positive reinforcement from you, she will look elsewhere. If, however, you reinforce her intermittently, you will likely find her intrusions to continue.