A social life besides school can be both a healing experience, and a learning of coping/interacting skills as well. Often kids who are bullied only see the bullies, and their crowd, and fail to see others who are not in that crowd. As TJ said there are other kids, and activities going on besides what this group does but it takes time for all that past dust to settle to even see that. Unless this is a very small community school, there has to be other activities and other students to interact with.

The popular crowd isn't the only crowd, but your child's specific needs to heal from this must be addressed. Developing a plan say for lunch time when class structure gives way to more social structure for example can give a healthy outlet for many kids as a group, or as individuals. Talking to the teachers may give you some ideas as groups of bullies with the power to shun seldom just have one victim. Seldom do victims of bullying know why they are bullied or how to cope with it, and that's where teachers, and parents come together to work on those issues.

Sometimes we as parents don't even recognize ourselves that our bullied kids may be isolated from many other healthy interactions at school and may fail to address that as well. It's worth exploring if a child that's bullied has any other friends at all. It's a red flag when they have none.