Thanks for the replies ladies.
I put Advanten on the eczema last night because it was really bad. This morning it looked great and hardly red at all and then come bath time, bright red rash again all over her bum and back of legs. It has nasty looking pimply things too. Hmmmm, I am clueless as to what can be causing it.

I have goats milk soap so will give that whirl when it settles down.