Fight with sister. Were her actions justified? What's your view on my actions, her actions, the situation, etc?

Sounds like she's the one who's lazy. I would think that your mom can see through all that bs and let her have it for making you guys walk. She just sounds like a selfish person to me, especially knowing that your brother had just come from football practice. If I were mom id take the keys, or if their hers tell her she has to pick yall up or not hang around at the house anymore. If I were you id just remember the sh#% that she does to you now and when you get older, stay away from her azz, she doesn't sound like a person who's happy with her own life to begin with, don't let her make yours miserable too.