You do not suck at this. You are dealing with a very hard to deal with situation.
This of reverse DB. Think of her as DBing you. You don't believe any of this, because there is no time and consistency in her actions.
If there is true regret she will do her 180's, she will respect your boundaries and not only be regretful because she isn't getting what she wants. If she is regretful, I believe she will do the work she needs to do because she is not well. If not for you, if not for her, I hope she does it for her daughter.
