The power of social status in kindergarten

A few weeks ago when Genea was going to her first little kid birthday party, we went through expectations and discussed ahead of time what might happen. There might be games, food, the birthday girl will open her presents etc. Take turns, don't push anyone getting to the cake, and hold your jealousy over all the presents in until we get home. We also talked about what we should do if she started feeling nervous or if something happened and she felt the Wango Tango coming on, which is how I have been referring to her hysterical furious meltdowns. At the time, I was surprised at her answer. She said, "I will have to leave because I don't want anyone to see me like that."
Hmmmm.
No worries for sure, it all went fine and the wango tango did not pay a visit to the party.
I have told her things like this before. Things that most kids do, things most kids don't do. Often she has to be told. She was never in a position to learn how other kids are by being around other kids who are regular. Her developmental process went wonky the day after she was born and stayed that way. It isn't her fault, we just have to remember she never had the chance to learn by example.
Anyway, yesterday after school, she invited her friend over to play. It was a big milestone for her. Everything went well, the kid stayed about a half hour and went home. Later last night, I was talking with Genea about it and I mentioned how her friend sounded so surprised that there were diapers in their room. Genea has worn pull ups or diapers at night her whole life. In difficult times (ie, wango tango weeks/ months) she has had to wear them for naps. We have had issues with her trying to keep them on all day. She wants to wear them, damp, wet, dripping, she wants one on. I try to rarely mention the pull up situation, but I have told her that most kids her age don't wear them anymore. Our discount stores only stock up to 5t and she is about out of that size and I have told her that too. I told her, if she wanted to she could tell her friend that the pull ups belong to her sister, since that is true, and just not mention that she wears them since it could be embarrassing. Some things are private in our family and no one else has to know etc.
Last night she decided to go to bed without a pull up on. She just came up with it as she was getting ready for bed and told me she wanted to try. I did a quick mental scan and I figured we had enough clean sheets that we could spare a set when she wet the bed in the night. We have tried to make it many times before without success. I had realistic hopes (ie, a shred, just one shred not two, of hope).

She did it. She stayed dry. All night.
The power of social status is that strong.

But what is really scary is the power of this child's will.