Sounds great!
Over and above the recs you're obtaining via national offices, ask around to people you already know. Female relatives, friends of your parents, parents of your friends, teachers, people at church/synagogue, etc. Any alum of a sorority can write you a rec for that sorority. A rec will probably carry more weight if it says something like "I've known Erin for 4 years and she's a fantastic student" than if it's clearly just based off a resume and written by someone you've never met. And it can't hurt to have more than one rec.
(Please note that this is from the girl who's never seen a rec in her life
(northern school) but this is what I would do in your shoes.)
Good luck!