Anger and aggression is totally normally in little people in my experience. Around that age they start to be aware of some autonomy and control for themselves, but they lack the verbal and mental skills to help them manage their needs/wants = frustration on their part. Case in point, you example of the playing. She understands that it's fun to play and then in her mind she wants to stop/do something else, but she lacks the understanding that there is a better way to make that happen. In the past the explosion of anger has worked and so that's what she uses because it's worked before.

It's different when you are out. She's distracted by all the new stuff.

They also test their skills on their favourite people - us. We are their safe place, the people they feel OK to drop their guard and try out new stuff on.

How do you react? DO you mirror her or do you give her words to understand and let her know that she's still OK even though she's frustrated/angry?

I used to feel like I had the angriest kids in the world until I started to do a bit of research on it and employing a few of the tips I found.

for us it really has been a phase, but maybe if you're concerned, give your GP or MCHN a call and have a chat?