Though I've never dealt with this myself (my only drake has a gimpy leg and he is pretty chill about mating, only doing it in the pool), I think you are doing all you need to do. I'd set her in a nice grassy place where her feet won't get any poop or dirt in the cuts. She'll probably heal by herself. Also, making sure any water she has to bathe in is clean will help prevent any infection. Sometimes fisces in the water can cause problems, so I'd clean it out just in case. She'll likely want to relax her feet a bit after the rough treatment.