can someone help me with my sister?

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ok ive had it with my sister and there are several things that i need to discuss with her but right now i need your guys' help with something immediate

so my sister and dad get into an argument about driving, this usually happens, we went to see a movie and it was ok till the movie ended, i went to ask my sister how it was, she gave me a bland "it was good" in the most monotone voice possible, i try to ask her about a specific scene she said "i liked it" in the same tone. i asked my dad about what happened and he said "ahh she just hates it when she cant have it her way" so we get into the car and head back home. i kept pressing my sister answers about her new behavior, this is what she had to say: "i have realized that i will always be a chump in my fathers eyes, so i will forever be obedient and non chump like for the remainder of my like" now theres a thing you should know about my dad, if you ask him something a little to outrageous, hell say ok in that moment, but when the time comes to do the outrageous thing, he'll back peddle and call you a chump. this is something he would do to us as kids, but when we became teenagers and our demands got to be reasonable, he still did the chump thing, and so i guess my sister snapped and has probably lost faith in her father for requests.

so shes been talking in this monotone voice and she keeps stating "oh nothings wrong, this is the real (her name), why do you think im not talking normal?" it got old real fast and my dad went to talk with her as im typing this. can anyone help me out? pic unrelated