Let it go, you've seen no evidence she's changed- but you did. You evolved your mindset on abuse from your own circumstances because you exited a thing that wasn't working for you, she has not.

You can be kind to her- she reached out so maybe you can chat a bit, but I would say if their relationship made you uncomfortable 7 years ago I doubt much has changed. People generally don't change unless their circumstances force them to change or through a concerted effort.