Not if they're cosignees of the lease.
If they are “joint and severable” she could stuck. That lease language is common especially for inexperienced college students.
This is not correct. In the absence of a specific provision addressing the issue, which is extremely rare in residential leases, every tenant who signs a lease is jointly and severally responsible for the payment of the entire rent due. If nobody pays, the landlord can sue all of them, one of them or any combination of them for the entire amount.