[violetpretty]

As far as recs go, tell your teachers you are going through recruitment and see if any of them are members of NPC sororities or if they know if other teachers from your school are members of NPC sororities. This would be a great way to get a few recs since your teachers know you. Even if say, there's a teacher at your high school who you've never had, you could probably approach her and meet with her for you to write a rec.
Ask your mom to tell her friends that you are going through recruitment and see if any of them know anyone who is greek as well. For the rest that you can't find this way, contact your nearest alumnae panhellenic.

ETA: About you being a legacy, it depends how your school does recruitment, but my school uses a computer program called ICS, and chapters can only see which PNMs are their legacies. So if you are a legacy to XYZ, ABC wouldn't be able to see it on their page. The only way other chapters would know you are a legacy to XYZ is by word of mouth. If there are a lot of people from your high school that go to this university, it could spread easier, but if no one knows you at the university, it may not be a big deal. Find out how your school does this.

Granted, you have to find out if you are a legacy at all. I can't speak for all sororities, but if a member of Sigma Kappa were initiated and then left the UNIVERSITY, she would be granted early alumna status, assuming she was a member in good standing, and her sisters/daughters/whatever would be legacies. Again, this is Sigma Kappa, so check on how your mother's GLO works and her specific circumstances.