I've posted before about DDs "best friend" who has over the last year in reception, hit, pushed, threatned and today kicked her in the genitals.
DD insists she likes the girl and she is her "best friend". Now DD has other friends so doesn't NEED this girl....but she likes her. I can only imagine that she's fun sometimes. 
I have tried to explain to DD what a real friend behaves like...and to tell the teacher if this girl hits or tells DD not to play with other kids (she does that a lot) and DD wont because "then she won't be my friend"
I've had it up to here. We've been in and discussed it...teacher made sympathetic noises and promised to keep and eye on things...but was very much like us...thinking "oh they're little girls and they're learning how to socialise"
I am now going in after today's incident to tell them that imo this child is a bully and she is bullying DD and I want it to stop now. I want DD kept away from her. I KNOW that's hard...DC will play with who they like at playtime....but she's targetting my child imo and I wont have it.
I don't care that there is only 2 weeks left. I want something DONE!
Oh and DD says the girl asks to see her knickers too.
she is also a threatening little girl...her Mother is a police officer and she says "My Mum will put you in prison."