Dont bathe her as often, water is not good for eczema.
Obviously iis she is dirty etc you need to wash her, but theres generally no need to bath babies daily either.
We tried everything natural and lots of pharmacy products before our paed prescribed elocon ointment for DS1s eczema at 16 weeks, and it was fabulous.
It cleared up within 3 days and has never, ever come back the way it was the first time. He rarely gets any at all now.

ETA: QV bath oil!