My husband has psoriasis and sees a dermatologist who recently relocated to Gilbert and Baseline - it is called Allure. He really likes the doctor.
I have a suggestion though, your family physician can prescribe Acutane (a least they could 15 years ago) - I took it for about 6 months when I was in high school. It can have some side-effects like dry skin and lips, and a rash on your arms, and of course there are the really bad things like all medications like rare cases of liver damage and you absolutely can't have unprotected sex because the baby would be severly deformed. Wow - that made it sound like a really bad option but it is really a miracle worker for acne.
If your daughter is cautious and responsible you could look into it. She would have monthly blood tests and be required to be on birth control though so I don't know how you feel about a 14-year old and birth control...
**just had a rush of relief that my son is only a baby - and not a girl LOL**
There are lots of other options of course!!! The doctor is named Sam Smith.
Good luck!