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孩子现在是F2, 在大学fulltime注课，到今年九月生日满21周岁，F2 身份应该自动终止吧。

-Right.

如果现在向学校要I-20申请转F1,担心学校如果知道她F2身份，会不会不让她fulltime注课？ 如果等本学期结束后(五月）再转F1, 身份转换的申请除理时间很长，会在她F2 过期后，会更难批准吧？

-Your child has to change his status to F-1, and do it now for fall semester (put the F-1 effective date, i.e. I-20 effective date, on the semester start date). But because he has violated the status rule to enrol full-time study as F-2 holder, he may have trouble to get the F-1 approval. You had better consult an immigrant lawyer.