The answer to this is highly dependent on the terms of the lease agreement. I recommend you contact a landlord tenant attorney to go over the terms of the lease, any notices sent back and forth between you and the tenant, etc.
There are quantum meruit principles that must be considered when going over the lease and the agreement. It is possible that even if she makes a claim, the amount she can recover will be offset by the rent she did not pay.
In any event, it's important that you have an attorney look at any paperwork you have that is relevant to this case.
Best of luck.
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Review your lease agreement. If the tenant did this on her own initiative, without your permission and in contravention of a lease agreement, then she made these repairs to her own detriment. She can threaten you all she likes, but it's likely she doesn't have a legal leg to stand on if making these improvements were not part of your lease agreement.
DISCLAIMER: Brandy A. Peeples is licensed to practice law in the State of Maryland. This answer is being provided for informational purposes only and the laws of your jurisdiction may differ. This answer based on general legal principles and is not intended for the purpose of providing specific legal advice or opinions. Under no circumstances does this answer constitute the establishment of an attorney-client relationship. For legal advice relating to your specific situation, I strongly urge you to consult with an attorney in your area. NO COMMUNICATIONS WITH ME ARE TO BE CONSTRUED AS ARISING FROM AN ATTORNEY-CLIENT RELATIONSHIP AND NO ATTORNEY-CLIENT RELATIONSHIP WILL BE ESTABLISHED WITH ME UNLESS I HAVE EXPRESSLY AGREED TO UNDERTAKE YOUR REPRESENTATION, WHICH INCLUDES THE EXECUTION OF A WRITTEN AGREEMENT OF RETAINER.
Send me your lease agreement. Bill@kralawyers.com. We will look it over as a curtesy. Is your lease agreement far/bar, blue moon, or one of your own? Feel free to call to discuss with our office. 305-270-4137. Or fax the lease to 305-397-1065. Bill