DD has SEN and very low self esteem and is in secondary. She uses an sen room at lunch and this is her sanctuary. She hates school as it is. She is very quiet and has been struggling so much recently getting in a state about school we went to the GP.
DD went up to high school knowing no one, she made friends with a group of children including this particular girl but was closer to one of the others in the group. However the girl didn't like this and was jealous that her friends were phoning dd after school to chat and tried to cause trouble with dds new friends telling them lies about dd slagging them off and things she had supposedly said. The girl encouraged them to isolate her and also rang her from a sleep over to rub it in that dd wasn't invited.
At the start of this year this girl had a huge argument with the girls she had isolated dd from and started using the sen room, she also tried to make friends with dd again. I told dd to watch her back but dd has no friends and a bad friend was better to her than none 
This girl pretended to be friends with dd then tried to cause trouble with two people dd had started to hang out with telling them not to bother with her as she ditches everyone. This is because dd goes straight to lunch without waiting for people as dd has a queue jump pass due to sen. She continued this even though the girls took no notice.
DD had just had her braces off after a year. This girl was angry at dd because she has only just had hers on and created a fuss over it ranting at her. Then dd got her retainer and a clear one were as the girls is metal. Again she made a fuss over it moaning about dd getting a clear one on the NHS when she hadn't. DD said I had paid extra for a clear one to which the girl guessed it was because dd was self conscious about it and said she was going to tell everyone dd had a retainer on thinking it would cause dd to be upset.
This girl has is known for complaining about people to the year head if anyone challenges her so dd is quite worked up. She has a sister higher up in school who has been known to threaten to batter people and she plays on this.
It all seems petty drama but it really is affecting dd 