Geesh, thats a tough question to ask, I'm not a vet, but I would not think the calcium would make her appetite decrease and her weight to drop, if anything I would think it may be the antibiotic making her that way, I know in Bearded Dragons sometimes when people have them on medicines they do not eat well, so it may be the same for her. What exactly did he say her problem was? I do remember you were supposed to soak her, that did not help either? You could experiment like you say you noticed without medicine she ate, try it a couple more days(without antibiotic) and see if her appetite increases. Even though I'm not a vet what the heck is the difference, if ya stop it a couple days, if shes just losing weight and not eating while on it, can't be that benificial. As far as the 5 drops of calcium a day, dont know, I use (Sticky tongue miner- all) for all my lizards, I put small amount powder in a baggie add some crickets , shake, and bake, LOL no then serve, juvies everyday dusting on their crickets. Try a dab of neosporin on that red area, and remember, these are just my feelings, or what I may do if she were mine and losing weight not eating and still red, but hey you could always call the Vet back and tell him what your telling us also ! Wish I had a better answer, hope she gets better soon ! Eve