Hey, it’s okay! I have experience in veterinary care. (I help my friends mom out sometimes). Your guinea pig will be just fine! She probably IS in a lot of pain. What I recommend is going to Walmart or something and getting some guinea pig numbing cream. It helps them a lot with pain. What you should do ASAP though, is wrap it (not too tight, not too loose) in a small gauze or bandage. Or if you don’t have them you can take a piece of paper towel and fold it over, and wrap it on her paw with a piece of tape. If you are really worried about her, you could take her to a true vet. But I really hope the poor thing gets better! ;)