I worked in the veterinary field for over 13 years. Those bandages are notorious for slipping down. It's just a tough area to get one to stay on. Make sure your daughter keeps and eye on it and get it sorted if it slips. The dog will also have access to the incision if it slips down and could potentially start licking. Bigger and very active dogs usually have a tougher recovery. Glad the surgery went well and that she is doing well!