Hi LUDO. I am sorry to hear that your daughter is having these health problems at such a young age :-(
Is she using a convex flange? if not ask the stoma nurse about
them. I heard that they work well for a flush stoma. I was going to suggest Eakin seals but I am not too sure if they are the right thing for a flush stoma. its worth asking the nurse about
them though and see what she says. One thing that might realy help with the sore skin is no sting cavalon spray,it protects the skin from output and also helps the flange to stick better too.
let us know how you get on.