Being a nurse for 6 years, I have seen doctor's treat MANY minor burns. Their method was this:
Cleanse the skin on and around the blister with betadine solution or alcohol
Drain the blister using a -sterile- needle
Apply Neosporin or a comparable antibiotic ointment
Bandage
Doc's advice was to NOT remove the skin until the burn has healed underneath. He advised his patients that the blister was much more likely to burst by allowing it to retain the fluid, and that by puncturing and draining it with a sterile needle produced a much smaller opening, hence less risk of infection, than if the blister burst accidently. The story about "the fluid helps it heal" is an old wives' tale.
Of course, you should take her to the doc, because the degree of severity in a burn can be difficult to tell. I personally wouldn't touch it and would let the doc handle it.
