I suspect that this means that she hasn't learnt the difference between parents (and, presumably, other adults) correcting their children's behaviour, and more balanced friendship scenarios, and is trying out the behaviour that she's been most exposed to.

I saw several instances at her party where she thought she was doing the right thing by punishing someone for doing something that she perceived as bad (taking her food, upsetting her, etc) which obviously came across to the other kid as being horrible.

Perhaps there's some way she can learn about accepting other people the way they are, especially younger children.

Poor Jean, she must be so confused.