divorced but still she wants to go to school during iddah

My sister got divorced almost two months back. She is 18 years old. As far as I know, she is supposed to stay home for 4 months and 10 days. But she is continuing going to school . She is doing her 1st year degree (B.Com). The question is, Is she allowed to go to school only for studies, otherwise she will miss her classes and we generally don’t like the idea of allowing girls to go for tuitions later; or should she stay back. Additionally, she is my youngest sister and doesn’t want to listen to anyone at home. She fights with my mother and other sister too. Is it right to get some treatment done from an A’lim, during this period of iddat. We are a tablighi family. Please do make duaa for us. Thanks in advance for your time and advice. Wassalam. (Brother of the girl).