How about donating some of her work(s) to a galllery or museum where they would be on permanent display for all to enjoy ? I don't think I could sell them if they had been done by my family, in fact our grandfather was a quite well known local artist and a few of his works have remained within the family. Grandad was the black sheep of the family, almost bohemian compared to the rest of us so his oils provide a great souvenir of a special guy.