It seems her left cheek was more wrinkled than her right cheek.  Also, it's fairly common to find that the front of the cheek, closer to the mouth, wrinkles more than the rear half of the cheek, closer to the ear.  Look at the smooth skin that extends for a couple inches in front of her ear onto her cheek.

If you look along her jaw line, you can also see some irregularities of skin pigmentation that commonly occur as a consequence of any skin resurfacing operation.  But the peel also removed some irregular hyperpigmentation that is common in skin of persons her age.