You should buy clothes, bed sheets (twin long), down comforter and towels in the States. They are cheap there. Also another reason is that I am sure your daughter wants to buy clothes so she will look like other students.
Salem is more south and so it is not as cold as the north east. When you get to the school, you take a look at what the students have, especially American students, since they are more familiar with the typoe of clothing your daughter will need when she is there.