[Babs was in need of some fun that didn't include skinning deer or crafting leather armor. Skyrim was a great way to blow off steam and clear her head, but she was only 21 and she needed a reminder of what real fun looked like. With all her friends pretty much gone from Burnside and her bat family unfamiliar at best, she couldn't ask any of them to go dancing with her without constantly worrying about stepping on toes (figuratively). She needed to make new friends and some in the other door would be even better.
And for the record, she did make shirts
. No, they weren't the highest quality or even the best thing to have on your shirt when going out for a night of partying, but Barbara didn't care. If they could have a good time being goofballs, they could get dressed up next time. She was wearing her shirt with some cute jeans and her red hair curled to look flowy and princessy (which contrasted the TRASH lettering on her shirt nicely). And she had Ronan's shirt wrapped up in some dollar store wrapping paper with purple stars all over it. She thought that (plus buying him a few drinks?) would make up for taking a sabbatical in another door.
She waited near the Marvel door and tried not to look nervous. It didn't really work. When was the last time she made friends, anyway?]