I have Windows 8 myself and it runs fine. :3 Try changing to Dercit3GL or her GP and RAM might not be able to play FH. Just a question
What is the brand? Asus, Dell, Acer ect.
What is the model? Notebook (Normal sized laptop but thinner with keyboard cooling) Netbook, gaming ect.
What is the size and how many tabs does she have open?
Fan streangth.