I'm part of a playgroup that used to meet regularly for play dates, although now we don't see each other as much, because everyone's gotten busier. I still consider all the women friends, and we do see each occasionally. One mom in the group (L) has invited me to all her parties the past couple years including cookouts and birthday parties for her kids.

I was talking to one of the other mom's in the group (M), and she asked me if I was going to the birthday party for the son of (L) next weekend. I hadn't heard about the party and told her I wasn't invited, which shocked M! She said all the other moms in the group were invited, and she doesn't understand why I would be excluded. I can't think of any reason L wouldn't invite me, unless she's trying to keep the guest list small, but it's still strange to only exclude me and my kids. M thinks it was a mistake and L forgot to include us in the evite, but I'm not sure if I should say something to her or let it go. What would you do in my situation?