Also, regardless of what the person does, I would expect them to still be professional. I have had many a bad meeting during the day and I was still expected to do my job professionally for the rest of it, including manage people. If she is unable to do that perhaps that is part of the issue with needing an improvement plan.
I hear what you're saying, and you're not entirely wrong. For example, I had an issue today during 1st period with a student who was extremely rude and disrespectful. After a nasty confrontation, I was a bit "on edge" emotionally at the end of that class, yet 2nd period rolled around anyway, and I had to put on a smiling face and teach that group of students. This doesn't happen to me often, but it does happen.
But that -- your equivalent of a bad meeting -- wasn't personal to me. The student was just being a jerk. I know I didn't do anything wrong, and I didn't feel badly about myself. 17 year old boys do things like that, especially six weeks before graduation when they think they have the world by the tail and they don't have to listen to that stupid old teacher anymore.
What happened to this teacher is HIGHLY PERSONAL. She was told that she, personally, isn't good enough for this job, and she's got to shape up and do better. She's also just faced the idea that she could be without a paycheck very soon. It's one thing to know that many people are losing their jobs and are hurting; it's quite another to be told that soon it may very well be YOU.
Also, I think this was poor timing because there's little the teacher can do to improve mid-day. Her lesson plans are already in place for today -- hopefully for a few days. As much as she may WANT to do better, right now, right this minute, all she can do is continue with the lesson she's already prepared. The lesson she was just told is crap. If you want her to do better, don't put her in that position -- not when an alternative exists.
A good administrator would've brought this teacher in after school, explained exactly what she needed to improve, provided her with help to improve it . . . and then told her to go home and work on making tomorrow's lesson something outstanding (because obviously, she'd be observed). I'm not saying that the administrator should cushion her shortcomings or that he should walk on eggshells around her mistakes . . . rather, he should just stop to think about the timing of his message.
Makes me think about something waaaaay back when I was a first-year teacher and was still struggling to find my way: My principal, a wonderful man who'd been a teacher in my subject area, was standing at my door chatting with me between classes . . . and a student whom we both knew was failing my class approached. The principal began talking to the student about the value of the material I was teaching in class, and I realized mid-way through that this carefully-crafted discussion wasn't spontaneous, nor was it for the STUDENT'S benefit. I was a bit embarassed to realize that the principal was politely showing ME how to motivate a student -- he realized that, being young and inexperienced, I needed this lesson. I understood and learned from it. If he'd brought me into his office and reamed me out, told me to do better, etc., I would've been upset. His gentle example was much better.