What do you think about me watching my sister cook a whole turkey for lunch with her friends? Then she ate most of it the moment she went to bed,
Is it weird she ate so much turkey? How did she manage that?
It's weird, the turkey was huge, and I wanted it for myself.
It is your sisters turkey so she can eat as much as she wants. It would be wise of you to buy extra food for yourself as well.
How can a person handle such a large turkey? Who does she think she is? a werewolf?
It seems your sister truly enjoyed the turkey and didn't want to share. As long as this isn't causing her health problems, then it's best to not judge her actions and just allow her to live her life.