ADA and Tenant overreach/request

[Karen Spriggs]

Without giving all the details (too long here), I have a tenant who receives 94% subsidized housing and has some physical issues but inflates her "disabilities" to gain all the benefits she can.  Recently, she demanded (during a new door installation process) that she install electronic locks -- one she acquired (through grant?); the bottom knob didn't even match the deadbolt (electronic).  Even though I had purchased my own combo set, she rejected my (superior) locks and notified me she was going to have this contractor install her own.  I took the "rejected" lock set when I hand-delivered previously purchased new security/lever-style locks (upgrade from the previous locks) to the contractor.  She then circumvented those instructions and demanded he install hers.   I warned before she installed that she would need to pay to uninstall and reinstall the locks

The Coalition that provides her housing voucher recommended my sending a demand letter after this (for this infraction and for her not sending rent 2 months).  I did send this after 2 weeks (giving her ample time to correct).  The lease states directly that changing locks without prior written permission from landlord is against the lease.  She asked why I needed to install my lock.  I explained, also stating that no documentation had been received by her or the Coalition to present the need for the electronic lock.  My main concern is that I didn't have access (no master code or keys).  I saw an email she (tenant) wrote to Coalition (they sent it to me inadvertently) that she accused me of breaking the ADA law (and other false accusations).  We are to meet next week, but she continues to distort facts.  I researched ADA law and don't find that I have broken any law, but what are your thoughts? 

Thanks!