Wow! Your posts about your daughter's battle plan to win her friend back made me want to smile then cry myself when it didn't work! I remember several years ago asking my then DS3 (he's six now) about his friend at preschool and hearing his solemn, tiny voice saying, "she's not very interested in my friendship." It was a bit heartbreaking- even with the "they're only three" perspective.
Mine is one who does not "let things roll off his back" so we have had some sadness over hurt feelings. There isn't an easy answer-- my DS6 tends to pick one friend and stay with that person- probably due to nervousness in groups. We're dealing with it by working on his confidence and self- focusing on how he feels about himself and what he can do to grow as a person. Basically, developing the character to "be" a good friend and have authentic interests and values that would attract like minded potential pals. It's a work in progress.
We did go down the road of parent battle plan "how to make friends at school." It was a disaster and quickly abandoned after my son disrupted class several times.
