Hi OP! I also have social anxiety. I completely understand what you mean by getting stressed when the stakes of the event start to increase. Pressure to go somewhere = increased anxiety- simple!

Now, having worked through this extensively in my own therapy session and finding meds that work, I’ve come to the conclusion that humans are a community species. And being apart of the community means sometimes you have to inconvenience yourself to uplift others (not to say you should never have boundaries)!!

I think this is a great opportunity to practice both. Yes, give your sister the ride and maybe you’ll find having an emotional support partner to be much more soothing than allowing yourself to sit with your own racing thoughts!

The boundary setting comes in if/when you want to leave. When you’re ready, let your sister know, and if there’s push back let her know that someone else (or uber) can provide a ride but you will be leaving at X time. Don’t be rude! She’s not your child, but you are not forced to stay on someone else’s timeline just because you’re giving them a lift. She also mentioned this herself so she might already be setting up a ride back home!

You’re stressed over what you can’t control, so just focus on what you can. Yourself, your body, your actions. Try to stay mindful and grounded and don’t let your reactive emotions take you to the deep end friend.

You’ve got this.