he house I purchased has a renter in that was told when or if he sold the property she would have to move we gave her 30 days she was to be gone may 31st and she will not leave.
If the tenant has a written lease, no one can order her/him to leave.
The former and/or current landlords could negotiate with her to vacate the premises.
However, that usually requires someone to pay the tenant to vacate the premises.
The current written lease should also be amended in writing and signed/dated by both parties indicating the compensation paid for her to leave early.
If, on the other hand, she has no written lease; the landlord is required to give her written notice that the tenancy will not be renewed. Such notice might be 30 days, maybe 60 days (or some other amount of time) to vacate.
If she decides NOT to leave, then off to court the landlord must go to seek a legal eviction.
There is usually a block of time to wait before the matter is docketed to be heard by the local judge. In many cases, a six to eight week period passes before the case is heard. There could also be certain delays, further allowing the tenant to stay in the premises.
I suggest you negotiate with her, offer her CASH for the keys IF she voluntarily agrees to leave.
Put it all in writing, and pay the cash ONLY after she is out and damages have been assessed.
You could also consult a local lawyer to assist you in getting the woman to vamoose.