Myf, no matter how much the label of the shampoo bottle states it is mild and soothing and kind, any flea shampoo has chemicals in it that are going to cause a possible reaction with a dog who has just been through the trauma Lades has with her skin.
I'm with Crested or whoever siad to stop using the flea shampoos. Find something medicated specifically designed to calm down skin allergies/flare ups/reactions.
And of course, wash Lades as little as possible and perhaps consider another forum of flea control.
You know, I've never had an issue with the successfulness of Frontline, but I am hearing about a heck of a lot of ppl who just aren't finding it works for them any more.