hi sarah,
just surfing through. i am in jersey and have a FABULOUS RE/PCOS specialist. here is the link. Dr. Cheung Wu is tops in his field for PCOS and will treat your sister even if she is not trying to conceive. he has patients as young as 16 and as old as 60!
http://www.dvifg.com/. when i first saw dr. wu i was nearly 190 pounds, got down to 160, conceived my son. returned to him was back to 165 after delivery, and am now down to 140, conceived #2, currently 6.5 weeks along waiting for u/s. their services are FABULOUS and have registered dieticians and counselors on the team as well.
feel free to PM me if you need more information.
good luck to you and your sis.