***Updated: I forgot to say that there IS that rule on how many children you invite to parties. (General rule is 1 kid for 1st birthday, 2 kids for 2nd, 3 for 3rd...) We did actually try to stick as close to that as we could. ***
I'm sorry, but I actually DID laugh out loud at momof3's answer. I mean seriously, how old are we? It sounded just like a girl I went to Sunday school with as a child, lol.
None of us knows enough to know if someone likes you or not, if someone is "cruel" or not, blah blah blah. I think we've all been in that situation at one time or another. We've probably all unwittingly been the other person in the story at least once as well.
The first things that popped in my mind are that she could have been keeping it simple and small, and if you're the person she's known the least amount of time, you may have been left out just for the fact that the party was staying small and like someone else said, you just can't invite everyone. Sometimes, it's an issue of comfort (are you in the little group of friends, or would she have to feel like introducing you to people and making sure you're comfortable all the while really just trying to deal with the baby), or it could be an issue of money (entertaining does cost), or it could be that it was just already planned, or it could be what my mom REALLY DID DO: she thought a party invite was the same thing as asking for a gift, so she didn't invite people to things if she didn't feel comfortable "like that". She offended a lot of people in my family even, because even though lots of people take graduation invites, or wedding invites to people you knew weren't gonna make it, and just send them out to everyone in their dayplanner, my mom wouldn't allow me to even send them to family members if we weren't close enough for mom to kinda "expect" a gift from them. (Grandparents, my aunt, honestly, I think that's all....and people were all mad at us but she was just like "that's asking for a gift or money" and wouldn't budge). She thought she was doing right.
Or my house right now: we're in a rental house waiting to close on our house that we're purchasing....we currently have 1 sofa, 1 glider, and 4 chairs that go at the dinner table. That is all! We're not having dinner parties like we used to, lol! When we get settled in and get all our stuff back to normal, yes we totally want to have a dinner for my husband's bosses, a coworker, and a couple neighbors. But for now, only one family has been invited over......because that's all we can sit!!! Or, maybe she's just cruel and heartless and hates your guts. (haha, kidding). But even if y'all don't "click", it's nothing to really sweat. It's just one person at church, no worries. Friendship develops over time though, don't write someone off over a child's birthday party.
And finally......my big rule of thumb......take it or leave it: when I am REALLY mad at my husband (especially before marriage), or really want to tell someone off, or someone really hurt my feelings, I put a little black X in the corner of the day on my calendar and make a little question mark 7 days from then. Just put it on the shelf...not telling you to ignore your feelings, just put them on hold for a week. I want to see if (a) it was PMS, or (b) it wasn't important enough to stress me out afterall. Thinking if it's important, it'll still be bothersome or hurtful a week later. If not, shrug it off and go on with your life. (But yeah, I had A LOT of little black Xs on my calendar when I was pregnant, especially with my second child). :P