1900 Census for Ridgway TWP Elk Co PA ED 42 Fitch extract shows that Caroline had 8 children/6 living. It lists son Ernest and Abbie, grandsons Ernest and Otis, and adopted daughter Maggie. I couldn't make that out before. It lists her birthplace as Pennsylvania, and parents as unknown.
It's not clear who her adopted mother is. Ernest and Otis are both listed as grandosns to Caroline (head of household), but Maggie is listed as adopted daughter, which technically makes her Caroline's daughter.