So I started to walk her back and forth and after 5 mins I lightly trotted her and she looked OK (although little stiff). She ate her grain with great appetite (as usual) and she was busy with the hay when I left. Mom checked on her hour later and said she drags one leg again a little. She gave her massage and it was OK again.
So my question is... Any ideas on what could it be? Could it be that no movement in stall for while could bring this problem up? Can it be EPM (I'm REALLY scared of that)? She has that bump between the front legs, so I think that may be after hot compress she felt pretty good and warm, fall asleep and stayed there for too long...?
Anyway, I called my vet and he said to watch her till tomorrow to see what will happen. And I definitely won't put her in stall for while too.