If there is no heat, no obvious cuts, then I would at least take her out a couple times a day and hand walk her for 20 minutes or so, to help the circulation. Look for even the smallest cut, or puncture. Condensing a long story, I had a mare who punctured her hind leg to the bone, was told by a trainer that it was just a cut, as I didn't want to call the vet out in a panic if it wasn't an issue, found out the next day that it was a puncture, took care of it with the advice of another trainer, but after a week had to call the vet out only to find out how bad it really was, and that there was a huge concern that the bone itself may be infected. It wasn't thankfully, but I do wish that I had gone with my gut instinct and called the vet out. She was never lame, and it didn't swell until the next day, but definitely something to look out for. Cold hosing is a good idea, if you could at least call the vet to talk to him, and maybe get the okay to give some bute, but I wouldn't advise doing it on your own without a vets opinion. Hopefully she's fine, and the swelling goes down soon.