The partial meals shit is kind of annoying, just order less, or, more realistically, stop lying about not stuffing all in your mouth, we can see you, you're either finishing something or there's a alot of partially decimated meals lying around to counteract it. Maybe she thinks that it's not a full meal if she doesn't chew.
It's probably her trying to bait people into complaining about her wasting food so she can tell us that she eats it all as leftovers the next day or something. Either way, all of the food Amber buys is going into a landfill, either one outside or the one inside a liveen, breatheen gorl.