Sentence 1: Brianna looked around quickly when the vase broke. 
 Sentence 3: Fortunately, her sister did see her break it 
 Sentence 4:  Her sister told on her as soon as their mom came home 
 Sentence 5:  Restricted to her room, Brianna irrationally blamed her sister 
 Option 1: She texted her mom to say she broke it. 
 Option 2: She was sure no one saw so she wouldn't be blamed for it.