Ask a landlord-tenant lawyer and get answers ASAP
If she wont take responsibility, you need to raise the pressure. You can tell her that unless she pays for this, she will be sued.
That may get her attention. If it does not, the amount is too big for small claims court, so would need a lawyer to sue her for the amount owed to enterprise. You can try to have enterprise pursue only her, but usually they wont interfere and pursue everyone since they only care about being paid.
Let me know if that is clear, and if I can explain anything else.
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If I can clarify anything at all, let me know