Today she was much better behaved, but when I pulled her out of her mud hole of a pasture, I noticed her off hind leg was a bit swollen. There wasn't a lot of heat in the leg, so I decided to take her up and see if she was lame. She wasn't off at all, but I didn't want to push her too much, so she got only the briefest of workouts. Fortunately she was very well behaved, so I did not have to drill her on anything. Here are some pictures from before and after I worked her. The swelling went down a bit after exercise. Unfortunately these are not the best pictures - it was so warm and humid outside that my camera lens kept fogging up, and the fussy filly didn't want to stand still!
The pictures aren't all that clear, but I think she looks puffy around the fetlock in all the photos. Before I left, I treated her leg with liniment. The barn owner will keep an eye on it, and hopefully I'll be back out soon.