You cannot deduct that amount but you can seek to have her pay her share of the taxes. If she does not want to, you can bring an action for a partition sale of the property. If she does not want to pay for the expenses of the property, you can force her to move and be done with her insofar as you are no longer co-owners of the property.
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There are several ways of claiming the property tax as a deduction against your income but because of the circumstances you describe, there's some complexity involved. Consult with a tax attorney or give us a call for the details.
Evan A. Nielsen
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Evan A. Nielsen is licensed to practice law in California. The information provided here is for educational purposes only and is not intended as legal advice for a particular matter. This response does not create any attorney-client relationship with the author. For specific advice about your particular situation, please consult an attorney.