Hi,
My son is the same age and we have been through a similar thing.
As soon as he started eating he was covered head to toe in severe eczema - he looked like he d been dipped in acid.
You can treat the eczema with steroids, but if she keeps being exposed to the underlying allergen it will keep coming back
With the steroids we have to hit to hard for 4 weeks and then taper off. Only after every layer of skin has healed, if we do it sooner it comes straight back - but your dermatologist should have given you information about this
Allergists can only really test for ige reactions (so swelling, breathing issues hives) the non ige (eczema, digestive issues) was only really worked out for us from excluding foods after keeping the diary.
I would start by keeping a food diary and log any flare ups. Hopefully you start seeing a pattern.
Dairy, eggs and soy are quite well known causes of eczema flare ups in young kids. You can cut one out at a time for 4 weeks and look for improvements.
I would join Facebook support groups - these have been a great help for us
No one understands the horror of eczema sleep deprivation until they have been through it. We are in the NHS system for allergist and dermatologist and my son is sooo improved. He rarely has flare ups. He has epi pens but luckily we haven't had to use them. We carry a anti histamine at all times. We have identified he has allergies to dairy, egg and peanuts and then eczema flares with oats also.
Things will improve but it takes time. My thoughts are with you it's just awful time when you are full of unknowns
And I completely understand no one seems to take it as seriously as you, but people do listen the more you advocate.