Hi, this probably won't be much help but I had an infected human bite years ago that filled up with yellow stuff and hurt a bit, I used a poultice of garlic with cabbage leaf to hold it all onto my arm then a bandage round that. It stung a lot tho but I did use lots of garlic, I don't know how your dd would deal with that so you could just use a bit of garlic and under a layer of gauze maybe rather than right next to the skin. Anyhoo it worked a treat, sorry TMI next but I just kinda soaked my arm in ttree water first then squeezed out the poison and that hurt,I may have lanced it first slightly, the soaking softening the skin for this and to ease the pus, on with the poultice, after a week it was on the mend, left with a round pit like scar but my arm had swelled quite a bit and the stuff needed to come out. Try find other methods to clean this bite and clear the poison, cabbage is good for drawing out as is garlic just stings. Hope your dd gets better from it soon.