1850 census showing Martha Pendarvis. There are only 2 which fit what you are searching for. Perhaps some of the other more informed Pendarvis researchers will help.

Wayne County, Ga 1850
PENDARVIS, Lewis 45 b. SC
Eliza 30 b. Ga
Margaret 6
Martha 3
Caleb 1

Wayne County, Georgia 1850
PENDARVIS, Caleb 39 b. SC
Elizabeth 39 b. Ga
Henry 17
Martha A 15
Isabella 14
William 12
Rachel 10
Elizabeth 9
Georgia A 6
Amelia 3
Joseph 6 months
Charles 6 months ( twins )