Today I spoke up against my gmaw for the first time

My car got crashed yesterday, and my sis has offered me to buy her car at a very low price.
I told my gmaw this,and her answer was "You can't buy that! It's impossible for me to get in and out of! You need to look for something better"



I told her I can't base my life on her needs, and whenever I need to take her to an appointment I can always use her car.
Also,my options are to get a good car for way less than what it's worth (sis' car) or find one that's basically shit bc I can't afford to spend a lot.

I feel proud of myself for actually speaking my mind for once, and she seemed to understand how selfish her response had been and agreed with me.