Her instant reaction is screaming. Tantrums are just screams.. Or lashing out. Especially over a toy with big sister. I try to talk to her eye level, calmly and ay use your words and mumma will help you. What's wrong.
It's bizarre as well as she is very forward and advanced for her age, speech is impeccable. But also lashed out in frustration.
Maybe it's because it gets the reaction?