Yikes, I'm not sure *I* could have held back the puke.
I think the best you can do is to let her know you're willing to help if she ever needs it. You might also suggest that she look into support groups for families of vets with these kinds of issues--I'm sure they must exist. Make up a list of resources in your area for victims of abuse--not to give to her right now, necessarily, but to have ready in the event she comes to you in fear.
Hugs, I'm so sorry you're having to deal with all this.