What is mental abuse? Gaslighting or disagreeing with someone's beliefs? The latter is not gaslighting nor is it mental abuse and therefore not a crime. It would be quite a stretch to call this gaslighting.
I would be interested in knowing exactly what these documents stated. I'm almost absolutely certain your actions fall well outside of the definition and it is in fact she who's trying to gaslight you.
What she says is false, check. She trying to make you doubt, check. She's says it to manipulate you, check.
She's the gaslighter, it's even almost working, you're in doubt. Don't fall for it, confidently tell her to fvck off and never talk to her again. She can't do sh!t.