They are intradermal tests?
2 y/o screaming all day long - Page 3
So they stuck her with a bunch of pins, probably on a board, on her back and observed for wheals/redness/swelling?
That's an IgE skin prick test (SPT is the usual abbreviation in forums).
She can still be reactive/intolerant/sensitive without testing positive to IgE SPTs (or a RAST blood test, which also tests for IgE allergies), and it would be just as important to get those things out of her diet. Many typical (Western MDs) allergists don't recognize non-IgE reactions, so they're a lot more difficult to figure out.
That must have cost a bundle.
I'm still thinking it's IgE and she could have some intolerances/sensitivities that don't show up on that test.
Nice that you have access to a holistic ped. Our allergist (and dermatologist and ENT) at Children's Hosp have been not to my liking. "You'll never figure out what's causing the eczema." "Steroids!" "Surgery!" In that order.