My 12 year old has pimples on forehead that get pus. She is using Proactiv but they do not seem to get better. Is there any other remedy? Thanks!

Many OTC & scripts. It seems she some inflammatory acne with closed comedones. Otc such as clearasil or any of the benzoyl peroxide containing topicals maybe of benefit. Do not scrub the skin too hard. If not adequate, consult your doc/dermatologist for an evaluation--they can select a medication better suited for her skin i.e. Oily vs dry etc...Good luck.
Yes many. There are a lot of remedies other than proactive like Retin-A and others. I would go to your pediatrician or a dermatologist to discuss with them what is the best option.