Just the legs for the SA smoothing cream. It’s not an acne cream. I am suggesting it on the assumption the legs are not acne but something like keratosis pilaris.
Re referral to dermatologist: without seeing her level of face/back acne it is hard to say. Dermatologists can prescribe stronger stuff but will want you to have tried the less strong options first which can be done via GP.
For her face/chest/back acne, the options via GP should include Epiduo cream (which is benzoyl peroxide plus adapalene, a retinoid, so a bit more effective than Acnecide) and/or specialist contraceptive pill like Dianette, and/ or antibiotics (personally I’m not keen on these due to gut effects but many people have found they work). I would also recommend Cerave cleanser.
A dermatologist would be able to prescribe Spironolactone or Roaccutane but Roaccutane is last resort due to nasty potential side effects including MH issues.