Cattie, during this troublesome period where I noticed the nappy deterioration, DS started to get a really angry red nappy rash, too. It basically covered the entire region under the nappy, not just the bits at the front that would be exposed most to his wee. We barely kept it under control with liberal coatings of MagicStick, but as soon as his teeth came though it has disappeared, so I wonder if he is prone to extremely acidic wee with teething. So could yours be teething? Has she been ok before, in cloth? And have you tried adding extra stay-dry type liners - a couple of layers of microfleece, for example?