Sentence 1: Marie was noticing her food was going missing. 
 Sentence 3: Marie bought a small refrigerator for her room 
 Sentence 4:  She began to put all her food in her room 
 Sentence 5:  Marie's food didn't disappear anymore 
 Option 1: She suspected her roommate was stealing her food. 
 Option 2: : She suspected she was  eating too much.