You and your D would know best as to whether she’s a good fit and have plenty of time to figure that out (as well as her exact admission plan). Being admitted is indeed the hardest part of the process; the retention rate after first year is 99% and about 91% graduate in four years. Based on those stats, it’s highly likely that if she’s admitted and decides to attend, she’ll love it. By the way, being a woman interested in astrophysics will probably help her admission, all else equal.