The girls I know that went to Bnos Avigail are very bright, creative girls (2 yeshivish-not extreme, one not so much) who are really nice and got accepted to top seminaries. They all chose to go there precisely because it’s not an in-the-box sem, has brilliant and deep, thought-provoking classes, and also a lot because of Rebbetzin Heller. They say there’s a very nice mix of girls, and from what I understand, is not judgmental at all.
The best thing to do is call girls who are there and ask them to describe what type of girls are there.