UPDATE: Well, Kayla has informed DD that they are no longer friends. 
DD said the girls were riding the bus home from school and the following conversation happened:
Kayla: My class is SO going to win the school's Especially Awesome Good Behavior Award for Best Class this week. We have 70 points.
DD: But my class has 90 points.
Kayla: NO YOU DON'T.
Nice Neighbor Kid Brother pops his head up over their bus seat: Yeah, they do. I looked at the board before we left school. And my class has 85. Your class is in third place.
Kayla: That's it. DD, we're not friends any more.
DD: OK, then.
We'll see how long that lasts, but for now, DD isn't that concerned. She's out playing with 5 or 6 kids from the neighborhood and having a good time.
Whoa. My jaw is hanging open because I just had a very similar conversation at work yesterday with a 60 year old coworker of mine. So the idea that kids like that can grow out of that behavior... well, my coworker did not. And I have to say that working with a 60 year old version of Kayla is honestly making me consider leaving my company.
Is it wrong that some morbid part of my brain would like to see a transcript of that conversation? It would be like looking into the future.
Ugh. Sorry, if I relive that conversation, I'll just get irritated all over again.
My take on it is that the older version of Kayla has gotten both more persistent and possibly, sneakier. If she gives up on her game for now, she'll just revisit the issue over and over and over. Even if it means following me around the building - - I am seriously NOT kidding. I ask her to leave my office, she comes back. I leave my own office, she follows me. I ask/tell her to let it go and she tells me, "Sorry, can't. We're going to hash this out until you see I'm better than you are and admit it." I close my door and she will stand outside it and still keep talking. She is eagle eyed in terms of watching and waiting for people to make the smallest mistake and then she pounces on it because it's an opportunity to point out how she's so much better -- and if you point out how she's made a mistake of her own, she flounces, then stomps around until she can come back with something else. It's like having someone constantly watching over your shoulder to pounce. And she's also gotten sneakier in that she knows better than to do it in front of our boss because he'd call her out on it, but won't call people out on behavior he does not witness for himself.
In some ways, if I disengage, I can feel sad for how pathetic she is in her need to be superior. Mostly though, I just have to control the urge to smack her hard, especially when she gets this... smirk on her face when she's sure she's "won" in some way.
UGHUGHUGH!