Check out the acne.org face wash and 2.5% benzoyl peroxide at
https://danielkern.org/ I have been using the entire regimen for a decade and my daughter (now 14) has been using the face wash and benzoyl peroxide since she was 11. She has super sensitive fair skin and so far tolerates these products without redness or irritation.
Second the recommendation for Skin Smart spray (Amazon).
Hydrocolloid acne patches help with active pimples. Also try red and blue light therapy (like Solawave).
Make sure she keeps her hands off her face at all times. My daughter tends to lean on her hands and then breaks out where there has been contact.
As for the PPs who recommended dietary changes, that is the only thing that helped me - I was on multiple prescription medications after developing adult acne during law school, and nothing worked completely until I eliminated gluten and dairy.