Ooh, we could definitely go that route, depends on how severely Anya pushed herself. If it was really serious (ie: collapsed and they felt the need to call 911) then yeah Cheria could arrive via ambulance and give her some on-the-spot care. Or, if you want it to be a bit more low-key, we could say that there was a call for volunteers with medical experience (at a very small local show, I could imagine them making the call, similar to how they would ask on an airplane if anyone has medical experience when someone collapses) and then Cheria would have volunteered and come back to help.

Either is good with me :3 because either way them having a friendship sounds 1000% precious!