I dont know what to do what do i do?!?

ok my "best friend" has a myspace. she got grounded about 2 months ago and was not allowed to use the computer. anyway, she came over my house sometimes and would go on it. i didn't really mind. but then after awhile i was like ok.... get off you're not supposed to be on! she would also sneak on during summer school using liarz.com (this shows how stupid she is since she is in summer school) she also once used my cell and prank called someone 15 times!!!!! and she blamed it all on me. and she also said i've been using her myspace! and her stepmom says she has proof! but i only used it a couple times because she told me to check her messages! now her stepmom called my aunt and said she is going to come to my house and have a "meeting" tomorrow night. i dont know what to do because she has "proof" and then no one will believe me :[ i didn't though! and i of course will get the whole blame...... what should i say to my x friend and her? because i don't wanna get blamed!!!