In Tess of the D'Urbervilles, what plan concerning Tess has Joan Durbeyfield developed since hearing the news of their newfound heritage?

Joan is determined to get some advantage for her family due to their newly discovered connection to the ancient d'Urberville family. In chapter four, she follows her husband to the pub, where she tells him that she knows of a rich lady named d'Urberville living in Tantridge, a distant town, and her plan is to send Tess to "claim kin." Joan figures that their relations will be glad to know of this branch of the family, and even speculates that while there Tess might find a gentleman to marry, and become well-off. This variation on a common theme in other English novels (e.g., the lower class girl getting the higher class man, as in Pride and Prejudice, or Jane Eyre), far from securing Tess's future, sets into motion the events that will lead Tess to her ruin.