Here is how you START the process in NC -
"If a landlord wants to evict a tenant who will not leave voluntarily, then he must file a Magistrate’s Summons and Complaint in Summary Ejectment in Small Claims (Magistrate’s) Court. The tenant must be served with the Summons and Complaint by the Sheriff’s Office, either personally or by posting. The Summons will state the date, time, and place for the court hearing. Small Claims Court hearings are informal, but both parties may have an attorney, present evidence, and subpoena witnesses."
This is an EXCELLENT site for the info, from a reputable source (a source which I absolutely trust): North Carolina Evictions
If she does not own part of the property she's a tenant.
What would I do? First, do you think she would harm your Grandfather? If not, then I would send her a LETTER, return receipt requested, telling her you want her OUT - in accordance with the Statute I have posted.