K.G.
I wonder if she is making herself a bit raw from wiping so well, which will make it itchy? Does she take baths or showers? Maybe letting her have a bath to just play in, no washing, will let her soak the area to ward of any potential infections and soothe any rashes. Have her eat yogurt if she can eat that and make sure she is getting enough water/fluids and isn't dehydrated, a discharge from the vagina can be a sign of dehydration even in little ones which would be the feeling of still being wet without getting her undies wet really. Powder is a good idea but if your daughter is like most little girls they don't wipe or wash in all the creases and folds down there and it will cake up and get in them if there is any moisture. You could also give her a panty liner if she is worried about getting her panties wet. You could also ask her to sit on the toilet for a minute after she is done to make sure she really is done, what I mean is sometimes when people haven't gone in a while their bladders and kidneys are full and they empty the bladder and get up before the kidneys empty and have to go right back to the bathroom to empty the bladder again where as if they would sit for a minute then they could do it all in one trip. Maybe the bladder being full again might feel like wet to her because I am sure she thinks she shouldn't have to go again after just going.