Good day! Could you please tell me if anyone has experienced something…

Good day! Could you please tell me if anyone has experienced something similar with their child: tantrums for no reason, just crying and screaming... Today we came from a walk, I called her to wash her hands, but she started to scream(((( She wanted to eat chocolate pie at that moment which we had brought from the store, and I asked her to wash her hands first... And this is not one-time. Maybe I overindulged her? Or a crisis of some kind. Maybe to a neurologist. Help with advice((