Then tell your daughter that you have talked to the teacher and that you think the teacher is going to help her feel more comfortable in class. Sometimes just "planting" this belief in a child can help her feel like the teacher understands and is trying harder to meet her needs. If your daughter senses no improvement, then I would encourage the teacher to meet with your daughter privately and talk about her feelings. If the teacher asks your daughter what she can do to make her feel more comfortable in class, this may help. If it turns out that this is an insensitive teacher, then a switch may be indicated.
It also sounds as if your daughter is struggling in school. Do you feel that her teacher is teaching in a way that your daughter learns best? If not, then you should ask the special education teacher to consult with the teacher to give her some ideas about how to structure learning so that your daughter feels more successful. Since you say your daughter is sensitive and has a low self-concept, I'd get the guidance counselor or school psychologist involved in this plan right away. Your daughter needs to feel more positive about school, or these problems will get worse.