Oh, bless her, my heart is breaking just seeing her!
This is only our experience with advice from our consultant (this is not medical advice & I'm not medically qualified beyond first aid!). Our consultant advised only using steroids creams for 5 days (including Elecon, Fucidin, Fucibet and Tacrolimus which I think it’s a whole new catagory - her Professor was part of the development research team lol).
If we used them for longer periods, our daughter would get rebound eczema (I think that’s what they call it).
We always used steroid creams along with an emollient like Diprobase or plain petroleum jelly to help the skin’s moisture from evaporating.
It may seem paradoxical as baths strip oils from the skin but my daughter (now an adult) bathes every day & applies lots of emollient cream afterwards (no soaps with any sterates as she’s allergic to them). Even as an adult, after her baths last week I had to help her wrap her arms with Elocom, petroleum, icthypaste dressings, with bandages & compression bandages on top as taught by her specialist nurse as an inpatient; it’s not unusual to have a severe breakout at this time of year.
Oat baths have always been soothing. And she takes the antihistamine Atarax at night to ease the itching (it also makes her drowsy so useful to help her sleep).
I’d keep pushing to see a consultant; it took 5 years to keep being transferred to different consultants (we’d get the “I’m not sure, but I know a Doctor who might!” until we reached a Professor at a London hospital who’d been one consultant’s research supervisor!) and we finally had more treatment options open to us.
My daughter only wears cotton clothing & Sainsbury’s non bio is the current one she tolerates (but every child with eczema is different). We would also do extra rinses to make sure there was no residue left in her clothing (all long washes, no very short washes unfortunately).
I can only give you some tips which helped our daughter, and the above is definitely not medical advice, but every child is different. Keep an eye on her temperature or the lesion becoming very hot in case of infection (she’s had so many she’s lost count!), badger your GP for a referral, keep her cool & give her lots of love from us across the t’internet.
As an aside; we kept all kinds of animals when the kids were small - cockatiels, dogs, cats, Guinea pigs, even giant land snails! - to fire as much at their immune systems as possible. We did find that she’d be triggered by hay sometimes (but not consistently) so make sure she has a good wash if she’s in close contact with the piggies in case there’s an allergen in the hay dust that could be behind the sensitivity that’s caused this lesion.