Me and my bestfriend had a fight. should we stop talking?

i'm a girl for those who are wondering. Anyway... so we didn't really have a fight and we already aren't talking. so this started when i refused to go to a house party with her. it was her cousin who was throwing it so i figured that at some point she would leave me alone to talk to family/friends and dance with other ppl...its a party. so i said no since i didn't know anyone else there to keep me company plus i hated the neighborhood (ghetto).i offered to go if another friend of our went so they can keep me company if she did leave me alone, but she refused to even ask him to go. so obviously i didn't go. i guess she got mad and told that same mutual bff that she didn't think i was acting like a bff. its been a month and she hasnt even spoken to me again on the phone and never addressed this issue with me. i noticed she was acting weird and i invited her to the mall with me and our mutual bff. she said "no" "thanks anyway" giving no reason.. on facebook i try to talk to her and she gives me attitude, once referring to me as a quote on quote "bestfriend," saying she has no bff, and saying "blah blah blah" to my comment. she also stopped talking to the mutual bff for no reason. did i mention we all have been bff for 7 years (since middle school and we all lived in different parts of the state and went to different schools. it was four of us bff's and dispite being somewhat far away we had a very strong friendship). Also me and her has never had one argument. disagreements yes, fights no. i'm also a pretty good bff as well. i'm upset that this one time we had a "argument" so to speak, she cannot confront me abt it. yet me and another of our ex mutual bff argued every single day the point that he would say "i need asprin" and i'd laugh and we stayed friends for 6 years. as mentioned, i try to speak to her on facebook and she says insensitive things to me and our other bff. she also makes plans with and speaks to her other friends, ociates, and co workers who she's known for what, less that 2 yrs? so what do you think? has this friendship ran its course? what should i do?maybe there comes a point when you outgrow your childhood friends? maybe thats what she's doing and needs to change friends. but then again i think its ungrateful for her to throw away a great friendship in favor of being with people she's known for less than 2 years. and y not have both? i have friends and bff from high school and college and work, but my childhood bffs are more important to me. but is it time for me to move on as well?