Emma has hurt her leg before by running and I think it popped out of place or pulled a bit. She wouldnt put pressure on it for about a half hour, but didn't cry when I pushed on it, so we waited it out.
I ended up getting some special treats to coax her to walk towards me and eventually she was putting pressure on it again. Maybe you could try that to see what happens. It is probably just sore, like if we fell and got hurt
I'll be thinking of you guys!