Sentence 1: Gina wanted to keep the stray dog she found. 
 Sentence 3: So she told her mother all the good things she could come up with 
 Sentence 4:  But her mother had made up her mind 
 Sentence 5:  There was nothing she could say to convince her mother 
 Given Sentence 2: She knew she needed to prove it was a good idea to keep the dog.