The Pasco County Sheriff's Office said Maria Victoria Acevedo, 21, of Wesley Chapel, walked into the kitchen of her home around 1:40 p.m. Sunday and became enraged when she saw her 16-year-old sister using her bread to make toast, the St. Petersburg Times reported Thursday.
Investigators said the sister apologized, but Acevedo was not satisfied and she struck the younger girl twice in the head with a 6-inch metal cooking pot, pulled her hair and slammed her head into the ground.
The sister fled into her bedroom and sent a Facebook message to a cousin asking to call for help.
The incident was witnesses by the third sister, deputies said.
Acevedo was charged with domestic battery and released from the Land O'Lakes jail without bond.