I second my Mississippi sister's agreement.
Beachgal118, your girlfriends could probably write you recommendations. I know that in Kappa, actives (undergrads) can write recommendations for women going through recruitment at schools other than their own. I've written them for younger sisters of friends, etc. It's worth an ask!
About discussing your depledging, don't bring it up, but if you're asked about it (e.g. "Didn't you go through recruitment last year? What happened?"), I agree with 33girl. Just be honest and tactful, which it sounds like you are, and you should be fine. If a PNM came through a second time after having depledged a different group, I would think that Greek life and a good fit into a sisterhood meant a lot to her.
Good luck-- it sounds like you're doing this for all the right reasons.