@Caits While that does make some degree of sense (especially since she's probably never been argued with, being in the company of only immediate relatives since the age of two), I would think that her "teacher father" would have taught her such basic concepts.
Most five year olds
do actually understand complicated concepts like empathy, sharing and personal space, at least to some degree. They often don't have the judgement to use this knowledge to its fullest extent, but I would assume that one as intelligent as Abigale clearly is would have a better understanding of that than most.
But then again, I'm no psychologist. My knowledge of the 5 year old psyche comes mostly from personal experience and medical journals that I've only been studying for a few months at most. It says in your bio that you've done some medical studies in college/university, so be my guest and do as you please with this character.
Just bear in mind that I don't have to personally like her, nor does my character. That should say nothing about my feelings towards you. I actually think you're a fairly competent writer, given what I've seen of you in this RP and in Lady A's Walking Dead one. Just do what makes you happy. It might not even be too late to save our character's relationships...