I had 3 daughters in different seminaries, ALL with excellent reputations, Morot, Ra’beim, Aim bayet, madrichot, etc.
I can tell you that if a young woman wants to, she can take incredible classes, make connections with the kind of women you want your daughter to emulate, and grow incredibly both in hashkafa and limud during that year away from home.
I can also tell you, that if a young woman is looking to party, sleep late and just “zone out” she can do that to.
It is entirely up to the young woman. So my only piece of advice is to really, really, know your daughter, her friends and what she does, NOT what she says.