Thanks, everybody!!
No, the necklace wasn't a bid day gift - I don't think we could afford a Tiffany key for 49 people!
(Although luckily they make some pretty convincing fakes these days.) It was her HS graduation gift.
I honestly don't know if her legacy status affected her cuts. There were actually quite a few PNMs with sisters currently in the chapters (1 at Phi Mu, 1 at Kappa and 3 at Alpha Phi) and they all got into their legacy chapters.