Red Child Observation
I found a red flag word in you observation when you say " the upset child", upset is an emotion and people and children express of different way, so it is better describe how the child shows that she is upset. maybe, she doesn't want to play or she shows a different expression or she says something. I think that you can give more details about how she express her emotion verbal and not verbal. Also,you can describe where they are doing the activity because sometimes the environment affect the motivation of a child to do a specific activity.