City water or from your fresh tank ?
Is this the first time she's showered in the coach ?
Are you in a site for the first time ?
The reaction could be from anything ; I know I have them ; high chlorine levels in the city water supply , different laundry detergent used on the towel . Towel hung to dry after last use and developed some mold . Different wine with supper .
Any number of things could cause a reaction, you'll have to start taking notes on all activities , foods , clothing . If the issues continue , allergy testing is in order .
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.