I would double check with rental laws for your area as well as the terms of the lease. The lease may specify that you are jointly or deparately responsible. If you are jointly responsible as Rick's linked post suggests, then your recourse is to sue your roommate for her share.
Otherwise, you can just pay your portion and let the landlord go after her. One caveat though, the landlord would have the right to rent the portion to anyone they want to without your approval.
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