Should I be mad?

My parents still have legal guardianship of my daughters. So should I be upset about my mom taking my daughter to get her hair chopped off without me? I loved her long beautiful hair and I told her that she needed to think about whether or not it was what she wanted to do and not what someone else wanted her to do. That was the last I heard of it, and when I came home from work her hair was cut short. I was told that it was supposed to be a surprise for me but I will admit that I was mad. Not because she cut her hair but because I wasn’t there. They couldn’t have waited until I was home from work to go? Should I be mad? I can’t seem to let it go.