I would not think the worst, although, I am one to say that!
At any given time, one of mine is limping or walking "off". Currently it's been Beau for the past 2 weeks tripoding when he walks fast or runs. The last few days (I put him a deramaxx) he seems a bit better but it's also the leg he had major surgery on just 9 months ago. The leg has a history so i don't panic.
If this is the 1st time, I would wait 3-5 days. See the vet, and if it's nothing they can see as a reason, have the x-rays done as a base line. This way you won't worry and I'm sure she will be OK.
Sending prayers anyway since it can't hurt!!!!