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.
I know the pieces fit cause I watched them tumble down
No fault, none to blame it doesn't mean I don't desire
To point the finger, blame the other, watch the temple topple over
To bring the pieces back together, rediscover communication
The poetry that comes from the squaring off between,
And the circling is worth it
Finding beauty in the dissonance