She goes alone

Supergirl briefly looks over her shoulder, spotting Superman staying in the queue and she shuffles off, feeling her heart break a little, and finds a quiet spot to sit down.

Double checking she's really alone, she slides the black shorts off her legs completely to take a look at them, spotting the break in the elastic. There's no way she can fix these. There are some shops and things nearby, maybe she can find somewhere selling underwear and still make it back to the ComicCon. Or maybe she should just head home.