this exact same thing happened to my neice! i posted somewhere on here about this - dunno if you read it.
she was being taunted by these girls - mainly one ring leader and the others were just doing as the ring leader said! it stated off with names, then got to threats and twice she was beaten really badly outside of school.anyways - cutting a very long story short - the police were involved - the girls no longer thought they were big as the police scared them and they apoligised to my neice - and they are now all friends!! although it wasnt as short as this as it was a very hard time for my neice as you can imagine and my sister - it went on for about 4months - they even used to find out where she was going out play or if she was going up town and they would follow her and taunt her!
kids can be the evilist little

s on the planet - but she will get thru it - with the help from the school (who in my oppinion were useless!) the police and if u personally apporach this girls mother.