WOULD YOU DUMP HER?? ANSWER PLEASE?

My "best friend" hasnt talked to me since saturday because we couldnt go to a waterpark our only source of transport was my brother and he got in an accident a week before so my dad wont let him drive. i dint invite her to come i told her i was thinking about it and she invited herself i told her one week ahead dont get too excited it might not happen and she was really mad saying i ruined her weekend now she has a boyfriend she never texts me. but when they break up she wont have anyone to be there for her.... and dosnt talk to me she knows im going through rough family drama and wont even check up on me When we were back in school she never let me date any guy i liked shed always get mad if im talkin to them at lunch and shed make up some story about the guy. She even tried to get with one of my friends boyfriend while they were in a relationship..... Please help should i leave her alone ? im moving on the 29th