Is it wrong that I actually want Lucha Underground to figure out a way to make it a storyline?
I know, it sounds tasteless; but I think Lucha Underground can do it justice. Sexy Star could get a big head from all the controversy she's garnered and decide to teach 'other people' what would happen if they came across her path like that. Not just wrestlers, but people that can't defend themselves.
She immediately becomes the top rudo in the company and wins the Lucha Underground title at some point. You can bring in Rosemary at this point and have the two go at it for the title. She wins it away from her and eventually the two have a series of rematches, each one more brutal than the last and ending with the same victor; Rosemary. This would continue until she breaks down and goes mental, setting the stage for a loser leaves town match at Ultimate Lucha IV where you can have either side wins.
Now on the situation itself: I don't know Rosemary too well, I do know a little more on Sexy Star and I think it's absolutely low of her to legitimately break someone's arm like that. No one deserves that, not even your own worst enemy. She spent the time to come to AAA and give the fans a good show and that's how you treat her? You oughta be ashamed of yourself.