Im sure its been looked into & I only mention it as it was the problem for us.. Has it been check for fungal infection?

Rohan went 7 months & 2 GP's telling me he had eczema & when I finally asked if I should see a dermatologist, he found it too be ringworm! 3 weeks later with the right treatment it was gone.
This was on his back & while my Mum had eczema as a child we have no strong family history so it is obviously different to your situation with your DD's But thought I would put it out there anyway.