Help!!!! Best friend problems?!!! ?

[Tiffany]

So we were talking on the phone at it was getting late so she said "I'll just talk to you through twitter" ok so then we started talking and then she starts yelling at me like "You Bi***!!! do you relize that i read all of your tweets about me????" And she just keeps saying things like that and when she was done i said " what? The last thing i said about you was like 5 months ago..." and then i just tweeted "notice how i stay calm" then like 10 min later shes like "The only reason you stay calm is beacuse you the one who is a Bi*** and then makes me deal with you" so i said "It takes to people to fight" and that didnt make a difference to her so she just kept going on through the night and rambleing on ... And i tweeted "i hate being alone, i wish she would talk to me instead of blame and yell at me." So she said "good luck on the first day of school when your alone:-)" So i started Crying turned of my phone and went to bed... we've been friends for 4 years and every time we fight she never tells my why exactly shes mad... i love her to death but she never wants to talk it out she just waits for me to apoligize... so i want to think of shomething to say that will make her relize she is being over dramatic and mean... thanks