My mom had the best way of handling this (IMO), a hot plate of chocolate chip cookies and a glass of milk. She'd let me rant/vent whatever I needed to talk about and give me a hug and tell me that she loved me. Sometimes she'd give me advice, sometimes she'd just listen. But she sat with me and showed me how much she cared and that was more than enough.

We still have our chocolate chip cookie talks......although now that I'm older, married and have my first child on the way our talks are more "Well....I think I'm going to knit..." or talk about just life. :)

Since I'm having a boy...I don't know how in the world to handle that! I guess get his dad to take him to the gun range or go fishing.

I felt really bad for my cousin. She was 7 (now 8) and she had just moved to a new school. A lot of the kids didn't seem to like her because she was a tattle-tale (I blame my aunt for this, she's such a dork lol). Anyways, so my cousin made a couple friends finally and the night before the last day of school before winter vacation we went to Walmart and looked for Christmas gifts for her friends. She had been bugging us all week about getting them gifts and she seriously put a lot of thought and heart into what she got each of her friends.
When I picked her up from the school the next day she looked a little glum. It turns out that after getting gifts for everyone, no one got her anything. Now, I understand that you really can't expect parents/kids to be buying stuff for other kids. It's not nice to expect gifts and even then money is tight right now. But I still understood that she felt upset. I didn't know what to do :(
Anyways, I told her not to worry, that Santa was bringing a lot of gifts for her because she was such a good girl. And then I told her some weird story about how "One day I saw Santa!" and she got over it.
I still feel bad though :(

I would have let them work things out themselves the way my mom made me work things out myself.  I wouldn't have called the other mother.

I am there to listen and give hugs, support and sometimes advice. But I really think it is important for kids to learn to work through things like this themselves. I agree with the others that say that calling the mother of the friend (your friend or not) might not have been the best move. Then what do you do when your daughter comes home tomorrow and says "OMG MOM! I can't believe you called and talked to her mom!" Now you are the one who embarassed her when she could have found out herself the next day at school that nothing was really happening anyhow. If your wondered about a possible fight between your daughter and said friend, why not just ask her? And encourage her to talk to her friend about what was going on and why she wasn't invited. 

I have to agree with others who mentioned it might not be the best idea to make that phone call next time...my mom did that on several occasions during my younger years and let's just say I still remember the ill effects. There probably were several times that it happened and I don't know about it because everything turned out fine in the end, but it's kind of like playing russian roullette.

I don't even know how I will handle it when I cross that bridge. Seriously, I got choked up just thinking about it. Somehow I don't think crying along with my daughter is going to help, so I'd better get working on that now. lol!