Poor little thing. Maybe the baby wipes have some type of chemical on them that is irritating the area. As a grandma, I might just approach it like I would a rash. I would try some neosporin or triple antibiotic ointment after gently washing it with warm water and a cotton ball. I wouldn't keep wiping it though. It probably is very sore and gets irritated each time it is touched. I know you are doing your best to care for her. I hope someone with experience is able to assist you better than I am. I really don't know what to tell you. These are just ramblings of a grandma who cares. Sorry I can't be more help.