Hi J.!! My opinion is that it is infected, but I will still take her to the doctor to make sure. Now after that I recommend you go to your Wal Mart pharmacy and ask for some PRID. It comes in a lil' orange can. They do not have it on the shelf, they keep it behind the counter. My son had a brown recluse bite. We did antibiotics for a few days, seemed like weeks. Nothing happened, it got ALOT worse. It got so bad that we were actually seeing the flesh rot off. A lil' old woman told me to go get some of this PRID. I didn't believe her at first, but she insist I try it. At that point I had nothing to lose. So I got some. I also bought some bandages ( not band aids, but the bandage and bandage tape). I put some on his toe and the bandage itself. I changed it every 6 hours. Whenever the bandage started looking gross from him playing. I kid you not within a few hours his toe had improved. What it is is a drawing salve. I use it on everything and anything. My husband had a ingrown toe nail, it worked to clear that up. My daughter had a splinter that I couldn't get without putting her into pain, it helped pull that out. I hope this helps you. Good luck and let us know.
~S.