Sarah Wheeler (Larkin) - Possible error

Also I know that is very common but there is a inconsistency error stating that she was married before or at 15 .

I looked at Find a grave for Sarah Larkin wheeler and it shows she was born March 12, 1647, her parents was Edward Larkin 1603-1652 and Joanna Butler Larkin 1615-1686.
Did not find a sister Joanna, only her mother's name was Joanna.
Did look in Find a grave for Joanna Butler Larkin she did have a daughter Sarah but no
Joanna listed. Sarah Larkin Wheeler had a daughter named Sarah Wheeler Maynard 1686-1743.
Maybe it is in error. Hope this helped.