Who is Fertility Hollis from Survivor and what is their importance?

Fertility Hollis is the sister of Trevor Hollis. She meets Tender in the cemetery when he is looking for Trevor's grave. Fertility's real name is actually Gwen. She uses the name Fertility Hollis as a stage name for her job. She works for a man named Dr. Ambrose, who is not a real doctor. Dr. Ambrose finds couples who wish to have a surrogate mother carry their child, and Fertility sleeps with the husband. Each time they have sex, the couple is charged five thousand dollars. The worst part of it all is that Fertility cannot get pregnant. This is what makes her stage name so ironic.