SD called me yesterday to say she made the varsity swim team as an 8th grader! I couldn't be more proud. Did I mention she also wanted to tell me she loves me??

Well my bubble burst when I found out the her BM made it very clear that I should not attend any meets. Not sure what to do. I want to be there to support but not cause a disruption. I also have reason to believe that SD is being physically and emotionally abused and SD is currently collecting evidence (pictures and saved texts.) SD lives an hour away and DH and I feel so helpless. FWIW: DH is her SF not bio so he has no legal rights. Would you go to meets with your own children in tow? Or stay home? I very much dislike confrontation.
Re: SD14 and the swim team
If SD understands her mom's wishes, I would stay away. If your H were her bio-dad, then I would tell you you have every right to be there, but your situation sounds sticky - - if you anger the mom, could she stop allowing your H to ever see her again? Is there a CO for visitation?
If your H has rights with a CO, then bio-mom can b*tch all she wants, but going to a public swim meet is your right. I would, however, find a sitter - - meets are long and boring for little children, and you'll be able to concentrate on SD if you have someone else watching the kids.
There are other ways to support your SD without going to the meets. Send her an email prior to the meet wishing her luck. Often, meets are videotaped and you migth be able to see if you can watch her in a video afterwards.
Why does biomom dislike you so much? Because you married her ex?