I always just soak them in salt walter, which works as a mild disinfectant (use sea salt not table salt). Use warm-hot water (as hot as you can handle keeping your hand in). Since it's on her foot you can just stick her foot in a bucket of salt water. Otherwise I use a wash-clothe and compress the wounds 3 times a day for 5-10 minutes (or as long as they can handle it).
You want to make sure that it heals from the inside out, so when you're compressing it get off any crusties, etc. that may cover the hole. Ok, and I know that this sounds gross, but press around the sight and if any guck comes out then you know that a bit of an infection has started adn you should go see the vet.
Don't use peroxcide, etc. as it dries the outside skin out and the wound will close over increasing the likelyhood for an absess. You also don't want to use too much salt (the water shouldn't be cloudy) or this will also dry the skin out.
I have too many piercings and they act alot like punctures, so this is what I do for myself too when I have a new or irritated piecring