inspect her paws. especially between the foot pads. check for anything that might be stuck in there.
using your hands, gently apply pressure to different parts of her leg. from her hip down to the paw. paying close attention to her response will help you determine what location is causing the discomfort. particularly the joints.
look for any swelling. or any differences compared to the good leg.
if you can't identify anything specific, crate rest for a day or 2 and keep monitoring. it will either correct itself with time. or go in for vet visit.
~ jo and Gotti Boi (aka Thunder Thighs, aka Jughead, aka The Doo Doo Monster, aka Sexual Chocolate, aka Mister Smiley, aka Sofa King)