The best way to get past the elephant in the room is to just talk to your ex about it. If you don't understand what you did to her, she seems to have a pretty good idea. Just ask her if you can talk and ask her what you did that made her feel this way.
Sadly, if you know for a fact that you weren't mentally or emotionally abusive toward her theres not much you can do. Her perception of what happened is just that "her perception" If you know you didn't do those things than don't let it bother you. As long as you know the truth who cares what others say or think. the truth is the truth. People can fabricate stories all they want, but it doesn't change the truth. I say move on and move on knowing that you are not the villain she's making you out to be.
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Related Questions: My ex thinks I mentally/emotionally abused her I loved her and still love her It's been 3 months. We share the same friends I accept its over.I'm grieving but it kills me she thinks I abused her Help?