'I wasn't even the first person she told?' Abby thought to herself, as she internalized all of what was going on. This other person didn't seem too important or particularly adept so perhaps that was why she chose to tell her first - see how a blithering idiot would react and then try someone a bit more cognitively together. But nonetheless, Abby didn't like any of this - regardless of who found out first or last.
Abby blinked a few times as she sister basically read her a list of rules to her knowing about this. Should she have been taking notes diligently? Hopefully not, because she wasn't planning on doing it. But in all seriousness, what was there to stop Abby from telling everyone? From blowing her 'sister's' whole cover? There was nothing but her sister's intimidating ability to lift enormous amounts of weight standing in her way.
When Morgan slid up further on the bed towards Abby, she scooted farther back until she was propped up against the head board. She tried to make it look like that's what she was aiming to do because she was still a little groggy but in actuality, she was trying to put a reasonable distance between her and Morgan. "When did it start?"