There are many ways of selling old dishware, but it may be difficult for a senior woman to haul an extensive collection to a dealer. Due to her advanced age, I would not recommend that she contact someone out of the blue. Perhaps there is a friend or relative, someone that you or she can trust to assist her in finding a local dealer. She can either sell it to a dealer or to a dealer who sells on commission. Of course, if she relies on commission, she will get nothing if no one buys it.