Sentence 1: Sarah was walking along with her friend Brittany. 
 Sentence 3: Sarah received a call from her Mother 
 Sentence 4:  Her Mother needed her help with something at the house 
 Sentence 5:  So the girls headed home and not a penny was spent 
 Option 1: They were both searching for something to purchase in the mall. 
 Option 2: They went to a mall to go shopping.