I think it comes down to her probably having a more than adequate amount of tan lotion on as well as it being shot on a lower quality camera than you would typically see in a production setting. Think pure budget, so that would include photo shoots as well. You could probably replicate this decently with some careful tone mapping and fuzzing it a bit to emulate cheaper film. Then add in what they call distressing(wear marks) to the overall image, and you could make something match this style pretty well. Using the tanning lotion in the modern shoot would also probably help for authenticity.