Am I handling this right? Is there a better Way?

My older sister refused to drive 20 miles to my house for a road trip where I was driving to a remote town, with 2 other of us that will meet me at my house on My birthday mind you! but when I called to cancel because I wasn't feeling well she wanted to come over. She has drive me nuts for years! I told her how I feel but she goes from sweet to Nasty in 0.5 seconds. (an alcoholic)Think I need Alanon again.It's hard to ignore and I'm ready to just stop going places with her or having contact. Doesn't chip in for gas and expects me to cater to her. She has no regard for what I want when we go places and won't drive her car which is even better on gas than mine! I think she's being selfish and when I show a bit of selfishness for my well being I get jumped on. Instead of taking it anymore I come out and say how I feel kindly but firmly but it's breaking down my other sibling relationships because they gossip, I don't and find I'm alone more often now.Maybe better off like one other sis?