You need to provide a little more information or her wiki tree id. You grandmother may have been born in 1880 or 1980 depending on YOUR age, which only you know!
Is this her married name or maiden name?
Dates or approximate dates (and locations if known) of birth/marriage/death?
Names/year of birth - of any children?
Any of that information will aid people trying to assist you.
If you log in, you can click the edit button to the right of your question and add any details you might have.