Per Linda Johnson this is where the quote comes from:
Actually, Sister Hinckley DID NOT say or write the pearly gates quote. A woman named NADINE HOBBY said this right before she passed away from cancer. She was quoted anonymously in LDS author Jack Christianson's book "What's So Bad About Being Good?" because she didn't want her name used. However, Bro Christianson gave me permission to use her name now and let her voice be heard. I have done research on this for a while to find the source since I used the quote in a talk in 1997. Pass it on and correct the error!