Fiona (last name withheld) alerted me to this article 50 Tips for Healthier Skin at Any Age, which features helpful advice on protection from the sun, skin care, healthy living, what goes in your body, what goes on your body, and supplements.
The article states, "Your hair has oils on it, so when your hair is constantly touching your face, it is transferring those oils. Keep your hair back or find a new cut that features your face front and center." I would add that one should change pillowcases (in which case, it's advisable to buy more than one set of pillowcases) and clean their combs and brushes every time they wash their hair - especially if she goes without washing their hair for several days!
The article did not mention the use of AHAs and BHAs for exfoliation. For advice on AHAs and BHAs in particular and skin care in general, consult The Beauty Brains based on the popular blog and Paula Begoun's The Beauty Bible.