Sentence 1: Ariana works very hard. 
 Sentence 3: She decides to buy a TV 
 Sentence 4:  Ariana goes to the electronics store and buys a TV 
 Sentence 5:  Ariana brings her new TV home and loves watching it 
 Option 1: She wants to treat herself for the effort she puts in. 
 Option 2: She wants to treat her friends for the gifts they gave her.