Being a former teacher and psychotherpist I would tell you that what she is feeling is normal. All kids feel uncomportable about entering into a new situation... even I do.
I would also talk with the counselor and teacher and ask for their help to have them have a fun get acquainted game the first day.
During the summer, which is almost over, maybe you can find kids her age in your neighborhood and plan a get together day with one of the kids.
And by all means, don't "should" on her. "you should do this, you should feel this."