I think if the words your daughter said the teacher used are true, then it fits the definition of bullying because the teacher is in a position of power over your daughter. It does not have to be over time to be bullying, according to some definitions.
Gosh, this is tough though. I think if you have the guts to do it, I would not email, but schedule a face to face conference (or phone call) asap and bring it up then, in as cordial and non-confrontational way as you possibly can. The reason is that I would want an immediate answer without a lot of time to put any spin on it.
That is just my opinion though and easier said than done. Of course, she may have said something different, in which case it would be good for her to know how your daughter interpreted it.
