Social Skills

LLB comes out of yesterday's school social - which was sponsored by a club she is in - and she's a little ummm... distressed. She's not crying. She's not antsy... She's just "in a mood". You know... a little snippy.
"How was the social?"
"Fine."
"How many kids came?"
"Just a bunch of 6th graders and a couple of other kids." (I know the number was about 50.)
I took a breath and decided not to ask any more questions.
There was a moment of silence and then...
"Mom, Ms. M (her principal - 5 feet tall, ex nun, older woman, gruff but wonderful) embarrassed me. She came up to me as I was walking and talking to HP and our friend T and asked me if I was flirting. I wasn't. We are friends. But, my faced turned red. HP quietly said OMG! and continued walking away. I got stuck with her. I said no and then I went to the bathroom. Then she followed me and asked me if I was hiding. I told her I had to pee. She asked me if they were bothering me. I told her no that I came in here because I had to pee."
"Oh... I'm sure she didn't mean to embarrass you."
"Mom... Why did she do that?"
"I don't know. I am sure she didn't mean to embarrass you. Why don't you walk into her office on Monday and tell her how your felt? I'm sure she'd want to know."
"Umm... If she does it at the next dance, I will."
"Okay. Whatever you decide."
"Why did she do that? We are friends. And T was there. I certainly wouldn't be flirting if another boy was there. That's just mean."