I would do it the one time and see how she does - I wouldn't hit it with peroxide again. Keep her on some paper towelling or in a bare-bottomed tank with a hiding place but nothing in there than could get into the wound. Clean this little hospital terrarium daily and keep an eye on the wound. I think it's quite likely she'll get better on her own but I am not a vet - as Kurt advised, a trip to the vet is probably the best thing for her, but if that's not possible for you then this is an alternative. Obviously we can't promise anything though.