Help? School, enemy, social problem!?

last year i went out with a boy. this one ghetto girl was jealous and after i dumped him she's all like "yr so ugly" and crap like that. i was surprised i was never faced with confrintation (now i kno better) she started talkin about me behind my back. the said truth was she consumed her time to bother me because of a boy he doesn't like her! anyway thankfully her scheduel changed (because she started threatening one of my friends) she was out of my cl then i could finally live a happy year of sixth grade. she became friends with another girl. the friend is her "sister" or some sh*t lke that. but i dont kno her only throught facebook but she goes to my school. sure she seems nice but cross... HELL WILL COME TO U. she's nice to me but other people who has done the littlest things... she's terrible. did i mention she;s had in 7th grade?! anyways but she nice to me. the point is the girl that hates me is friends with the girl who doesn't like me. if she finds out that her friend dont like me... lets just say she'll bring me internal misery. i cant avoid her i have 3 cles wit her! and this year if the girl who hates me says one thing to me our abut me im gonna go all out on her, but if i do ill have tons of enemies. ill be hated by the 4 most powerful girls in my grade. which equals everyone else hating me. help? should i jus ignore the girl who doesnt like me and JUST b acquainted with the friend. idk... (sorry if i have spelling errors i was sorta in a rush)