Strange mixture of symptoms in 3 y/o 2 wks after bee sting - could they be related?

I've been websearching but can't find the information I need. My little 3 year old granddaughter was stung/bitten by a wood bee 20 days ago on her hand. Her hand immediately was painful, got very swollen, and was red. Treated with tylenol, diphenhydramine, cold pak. No systemic reaction. The swelling remained for a couple of days then gradually improved. She had no more symptoms until day 16 when the site of the sting began itching, and there were three hard white areas under the skin, a white ring, and red ring around that, this after she was scratching. Treated with anti-itch cream and bandaid, improved. The next day we noticed her stool is light tan colored with green spots. No unusual foods. On day 18, without any known injury, she started limping and complaining of knee pain. Today her urine has a foul odor and but NO complaint that it hurts to urinate, and the stool is still light tan and green. She did have an x-ray today and it showed soft tissue swelling in the knee joint. The pediatrician said not to worry about the abnormal color of the stool or the urine, but I know this isn't normal, and am concerned about the possibility of a liver problem. She has had Hep B and Hep A vaccinations. I am wondering if there is a possibility that all of these things are connected to the bee sting, since it seems like more than a coincidence that all of these unusual things would be occurring to a 3 year old all at once. Does anyone know of diseases that could present this way and that are related to bee stings/bites? I know that Lyme disease has a variety of s/s, but bees don't usually carry Lyme.