It's good to share with your roommate.
Amber is quite poor and hungry, her roommate Sky just got a large donation of food that will expire soon and can't finish it by herself.
Sky wants to use the food before it expires.
Sky offers the food to Amber and the two of them look up how to preserve it to make it last much longer than the expiration dates.
Sky binges on all of the food at once after smoking a lot of marijuana to make sure none of it goes bad.
Amber and Sky preserve the food together and make sure that it's all either eaten or stored properly, they feel closer as friends and roommates.
Amber judges Sky for being selfish and feels excluded, she doesn't want to help Sky feel any better even though she's sick to her stomach.