It's rude to yell at your sister.
Maggie's sister is playing with Maggie's doll.
Maggie wants to play with her doll.
Maggie asks her sister if she can have her doll back when she's done playing with it.
Maggie screams in her sister's face that it is Maggie's doll not hers.
Maggie's sister tells her she's done with the doll and gives it back to Maggie.
Maggie's sister tells their mother Maggie screamed at her and Maggie gets sent to her room.