Sorry you're feeling stressed about this. DS2 is often coming home saying his teacher said this and that when I ask him if she is this way with all of the other children he says no. After much investigation it is clear to me that my bubbly outgoing boy is hyper sensitive but only sees things that affect him and not others. He is a rule follower and tends to blow things all out of proportion if he gets told off. We have now got to a scenario of "cry wolf" because of him over-estimating the situation!
What I'm trying to say is that it is unlikely that the teacher is picking on her - it is only two telling offs in an academic year and teachers do make mistakes so I'm sure its not personal. Teachers have to be so careful nowadays so to show favouratism or a negative attitude to some would be risky. By all means talk to this teacher but it may be better to give DD coping strategies and not feel quite so bad if she gets told off.