[anonymous]

The first step is to get an accurate diagnosis.
She could have both food sensitivities and environmental allergies, or some other medical condition causing the symptoms you describe.
The only accurate test for environmental allergies is intradermal skin testing done by a veterinary dermatologist.
The only accurate way to rule out food sensitivities/allergies is prescription/therapeutic/elimination food diet. Very difficult to stick to.
Your vet will confirm what I have said (based on my experience)
Be aware that the blood test that your vet may recommend may not be accurate, that’s why my preference is to go directly to the dermatologist after medical clearance and other causes for the symptoms have been ruled out.