Sentence 1: Crosby's boss was decided to give out raises. 
 Sentence 3: She decided on the person that always picks up shifts 
 Sentence 4:  Crosby wasn't happy that she didn't get the raise 
 Sentence 5:  She wasn't sure if she wanted to continue working there so she quit 
 Option 1: She wasn't sure who to give a raise to, so she started evaluating and Crosby got the raise. 
 Option 2: She wasn't sure who to give a raise to, so she started evaluating.