At a court hearing Thursday, two medical experts testified that the pregnancy carries risks because the woman has epilepsy and is on medication. But they split on whether the pregnancy should be terminated.
The court gave the woman's parents guardianship for her when she became 18.
Last month, the judge denied the couple's request to allow the woman to move back home with them and to halt the proceedings.
Deputy District Attorney Dania Reid stressed there has been no motion or discussion to order an abortion in the case.
She noted Walker appointed the county public guardian's office as a "neutral fact-finder" to investigate the pregnant woman's condition in regard to her medical, psychiatric and group home care.
"It's not the county's role in this case to make any findings of conclusions whether or not this pregnancy should continue," Reid told The Associated Press. "That's entirely up to the court."
Olivia Gans Turner, spokeswoman for the Washington, D.C.-based organizations National Right to Life and American Victims of Abortion, said the Nevada couple have drawn the support of pro-life advocates nationwide.
"This is a cause we support," she said. "It's definitely their right to protect their daughter's right to have a child and to protect the life of their grandchild. There's no reason for this woman to be subjected to the danger and risk of an abortion because someone else thinks she's not worthy of having a child because of her mental condition."