If you've seen your great grandmother on WikiTree you should contact the profile manager for her entry.
Under her name/profile there is a line with:
Profile manager: _________ [send private message]
Click on [send private message] and you can share your information directly with that person. Good Luck.
Or try entering data in the free search tool at https://familysearch.org/
Examples below:
Name: Alma B. Applegarth
Event: Birth
Event Date: 30 May 1908
Event Place: Colerain Tp., Belmont, Ohio
Gender: Female
Race: white
Father: George Applegarth
Mother: Margaret Shreaves
George Applegarth
Ohio, County Marriages, 1789-1994 marriage:
01 Jan 1898 Belmont, Ohio
spouse: Margaret A. Shrieve
George Applegarth
Ohio, County Births, 1856-1909
spouse: Margaret A. Shrieve
child: David P. Applegarth
George Applegarth
Ohio, Deaths and Burials, 1854-1997
spouse: Margaret Shrives
child: D. Pierson Applegarth
George Applegarth
Ohio, County Marriages, 1789-1994
spouse: Margaret Shreves
child: David Pierson Applegarth