Hi Amanda - only just seen this thread else I would have posted sooner. My ds is also in year 2 and changed schools at the end of last term too. IT is really hard as he had a good set of friends at his old school, luckily he still gets to his best friend fairly regulary. HE is starting to make some friends, first playdate on Thursday. Thing is not only have the other kids made their friend groups, I find the parents are more cliquey.. althou I guess that it probably seemed that way to new parents at ds's old school as I made some good friends there with other parents.
Ds was getting teased by some girls from another class and was also haveing problems with a boy in his class(altho this boy wasnt just singling ds out.. he would tell other children they smelt and were the worst people in the world - makes you ownder what he is told about himself).
On both occassions I spoke to the teacher quick smart and they have been good in overseeing that things dont get out of hand. The problems have stopped as they were nipped in the bud. Think you were right to speak to the teacher. It is hard to speak to the other parent when you dont know them particularly well, and the teachers should be well versed in dealing with these situations.
hope your dd is ok, she sounds a really sweet kid. My ds is quite sensitive (he writes little notes too ) and I think sometimes other kids can pick up on this.
Sorry that not all posters are helpful, I guess some people havent heard of the saying 'if you can't say anything nice shut your mouth'