What she's doing is engaging in abusive behaviors with you.
She wanted you to be doing badly, to be dependent on her for happiness, and when you weren't, she tried to ruin the happiness you had. Taking your phone and using for that purpose it is a form of Isolation which is an abusive method of creating dependence. Trying to get you to stay when you were trying to leave was her attempting to use what little dependence she thought she had.
You're well shut of her IMHO.
We are star-stuff. We are the Universe, made manifest, trying to figure itself out.