The advantage of female applicant in engineering varies a lot from school to school. There was one article about it a few years ago. For some schools, it does not matter at all. In certain school, it is a little bit easier to be admitted. While for my D’s school, it may be not easier to be admitted but they offer good merit scholarships to attract the admitted female students to enroll. So you do need to pick the right school with that policy, and of course, with her stat on top of the admission range. By the way, my D’s school has ~25% female students in engineering.