Doris Jenney's works can occasionally be found on eBay. They certainly have a resale value, though, I suspect, not an amazingly high one. Try looking on live auction sites and on eBay to get a feel for the type of painting you have, as some examples of her work do better than others. The value will depend on overall quality, condition, and attractiveness. Ms. Jenney is not yet an artist whose signature alone will secure a good price. If you want to sell the painting, either try a local auction house, art dealer, or eBay; you could also go down the live, online auction route. If you sell online, remember to factor in a sensible amount for likely shipping costs.