AITA for refusing to drive my sister after she ruined the vacation for my dad and me

warning: bad grammar/ spelling  

some context: my dad M55 lives 2 hours away. My parents are divorced. This week long vacation of me M20 my dad M55 and my sister F18 was most likely going to be our last one where we are all going to be together for some time. (2-4 years). My sister left not 2 days after arriving.  

My sister just asked me not even 5 minutes after i got home to drive her somewhere. not 3 days after she had a fight with my dad and ruined the mood of the vacation and made a big rift in her relationship with her dad.

It boiled down that she did not want to be there and wanted to be with friends. My father is not that difficult even if my sister asks like a week before to not go to be with her friends he has no problem with that. My father will be a little upset but nothing big he can live with that. but my sister says nothing and starts a huge fight with her dad when we arrive at his house over him wanting us to stay for the time that was planned. After the fight my sister left the next morning on the train.

Now my sister goes and cries to our mom F57 and now my mother asks me over the phone the same thing again she is not at home. I say no as it’s just my sister’s request through my mom. My mom acts all offended again as it’s not the first time i say no to her "asking" me something that i already said no to when my sister asked me. 

If my mom asks me to do something that is for her, I do it almost always. but when i say no she starts to gilt trip me and so on. my mother even said to me over the phone that i don’t know how to live as family I find that rich coming from my mother that just was bluffing to idk punish me for not saving my sister 30 minutes in her day by my driving her somewhere when she can bike to where she want to go.