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Hello and welcome! My name is ***** ***** I am a licensed attorney who will try my very best to help with your situation or get you to someone who can. There may be a slight delay in my responses as I research statutes or ordinances and type out an answer or reply, but rest assured, I am working on your question.
If you both signed the lease agreement then you both are equally liable for the rent for the property. If you agreed to split the rent, then if she doesn't pay her half, then you would have the right to sue her for her half of the rent in small claims court each month until you find a new roommate to take over her place.
But even if she backs out of the lease, the landlord could still come after one or both of you for the rent since you are both liable for the entire amount of the rent.
Let me know if you have other questions...
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...