Sometimes like the Barbie doll you need to give people something that's for them, not just something that makes you feel good giving it. Because Mrs. Myers had helped him already by understanding that he would never forget Leslie. (13.57)
Once again, friendship is tied to the idea of generosity. Giving people the things they need is an act of larger friendship. By giving Mrs. Myers praise on Leslie's behalf later in life, Jess thinks he will be thanking Mrs. Myers for assisting him in handling his grief, and also honoring both his memory of Leslie and of his friendship with her.