Also, suicide watch is something I thought about but honestly I feel that is more a likely situation for the abuser. He has a history of threats and mental instability. It still makes me sad.

That is difficult, wrapping your head around feeling sad to lose a family member due to them becoming a monster but still being unable to let go of the many memories from before. I was very close to this person for 30 years and the betrayal is hitting me so hard, harder each day it seems.

More likely this person will be put away forever (already looking at 50 years) he probably wouldn't last that long. Our worst fear is that he gets killed in prison. He had a difficult life and it isn't an excuse AT ALL it just adds to the general misery of the situation.

I must have really needed to vent this morning, thanks for listening this far.

Prolonged abuse like that does damage that cannot be undone or fixed. Ever. Understand that foremost. In consideration of that try to not always walk on eggshells or serve pity dishes, as it is a constant reminder that you, and everyone else knows. Harder than it sounds.

There's not a ton to 'do' except buckle up for the long ride, be there as support and realize there's going to be random rough patches, for a long time.
Also, suicide watch is important, parent(s) may not want to hear it, scary subject, but emphasize the importance as it is a huge risk for her ( not in front of her of course).

Horse lover and ex equine therapy instructor myself, I highly recommend equine related therapies. Also other support animals.

Lastly, push aside the guilt, it helps nothing & you can't blame yourself. Try to be thankful the abuse has been stopped.