Sandy, although I always qualify my answers because I am not an attorney
, here is what I think. First of all, I would not conduct business communication via text message. Second, I would certify mail her a letter stating that her Notice to Vacate was accepted in your office on such and such date and the apartment has now gotten an Approved Applicant who has an assigned move in date.
You can then face two options. One, if this person does not move out, you will need to start actual Eviction proceedings as she is now not legally entitled to an apartment she has given Notice for, and you have someone waiting to move in. If the current resident stays and does not vacate, you are forced to inform the person waiting that she/he cannot move in yet, which means loss of income, marketing costs to recoup, etc.
Option 2: If you have another unit to move the person waiting into, offer that to her/him and see if this could save the lease. And for the person refusing to move, you could then say you are more than willing to see if she requalifies to remain in the apartment at the new rental rate. She can then re-apply, pay an Application Fee, and present all the info necessary for your Applicants. Chances are she would not qualify (and we already know she would not receive a great landlord verification from her current landlord, Hahaha.)
In any event, I would definitely call your attorney for advice on this situation. Obviously, you don't want to keep her (the current resident), nor do you want the hassle of going through an eviction. Depending on the state you are in, I have strong feelings that you cannot depend upon a favorable judicial decision either. Some judges/courts seem to interpret landlord actions as retaliatory and could rule in favor of the Resident who may say she was forced to sign the NTV under duress, that she has "cured" the problem by kicking out her husband anyway, and that he will no longer be onsite.
Let me know what happens!!!