How do you remove a family member's name from a land deed?

My grandmother sold my aunt 14 acres of land four years ago for $11,000, which my aunt told her was fair price. My grandmother gave her the deed to have the land removed and new deeds wrote up for the now separate lands. However, my aunt simply added her name to the deed for the whole property. However, my grandmother is still paying taxes for the property itself and has been for the past four years. She wants to remove my aunt’s name from the deed to the house and the property it sits on. Is there anyway she can do this?