"Need her parents 1st names!" -- You and me, both.
I know very little of her. She is buried in the same cemetery (Richmond Cemetery) as five other Magarys:
William H., Martin D., Esther C., De Forest, and Charlotte.
Of these, "De Forest" is particularly interesting, as after her death, Joseph remarried and had a son named "De Forest Stull". One could speculate that she is related to these other Magaries, but it would, at present, be just speculation.
I was unable to find her in any census before 1870, where she appears as "Stull, Maryette", age 20, in her husband's household. The handwriting is scribbly enough that you could read the "a" as a "u" or the "y" as a "g".
The Macomb Co marriage records list her as:
MARIETT MAGARY, b Mount Clemens, Macomb, Michigan, m. JOSEPH C. STULL, 04 JUL 1869, with his age as 22 and hers 18.
So, best guess is she was born c. 1850, near Mt. Clemens, but that's just a guess till we have more details.