I had cystic acne from age 11 to age 37-38. Just before my 38th birthday I switched to homemade soap - I'd been using it before then on everything but my face... not sure why other than the old "soap is bad for your face" mentality. The other change I made was switching from a lotion moisturizer to argan oil. My acne is pretty much non-existent these days, and it started clearing up within a week of switching to the argan oil. When I stop using it, my face shows it. I mix it up with some essential oils depending on my mood. My night time bottle currently has jasmine and orange in it, because I read that jasmine is good for treating acne and both are good for anxiety aromatherapy. My day time bottle has spearmint and eucalyptus in it, it's a nice refresher in the morning. When I first started using argan oil I added frankincense to it because I had read that it helps reduce the appearance of scars. I also tried tea tree in it, but discovered I'm allergic to tea tree oil. My first bottle I picked up at iherb.com for maybe $12 for 2 oz... now I buy bigger bottles from NDA. Anyways, all this just to ask "Is she using a moisturizer?" I didn't start using one until I was 33 and got a spa facial, the technician told me I have dry skin. I started using a lotion moisturizer and it did help but not "cure" it. I wanted a cure, lol. Argan oil is the closest I've gotten. Also, on a side note, if she is near a cosmetology school, they may offer facial services at 50% the cost of a spa. There is a school where I live, and I've gone twice in the last year for $20 each time. A quality facial may "reset" her skin so that you can evaluate if it is dry, oily, combination, and plan an at home regimen better.
*I am not a doctor or esthetician. My only qualifications are that I have skin and used to have very bad acne. I wish my mom/grandma had been half as invested in helping me with my skin problems as you are, Earlene.