First of all, im very sorry to hear what you and Lexi are going through, itch is worse then pain.
If i were you i would never put foot in that vet's office again!!
Like Yorkierose said, try to keep both your girls away from grass to see if that might make a difference, i never let my girls go out on grass they are litterbox trained.
Some fabric softners can also cause an allergic reaction, maybe an idea to change to a different product for their clothes for a while?
Hope Lexi feels well soon!!
Just keep trying different things on her till you have found the problem, vets tend to think they know it all... sure they know MUCH MORE then we do, but remember that Lexi is YOUR baby and you know her better then anyone else so i would say, follow your gut feeling, the problem might be in such a small corner that your overlooking it
Please keep us updated
Best of luck
