I’m always cleaning up messes!! I have very little respect for the Find A Grave information. Frequently their published information does not match Social Security Death Index (SSDI) and/or funeral home information. ~~ Read the complaints on this website and see that other folks are dissatisfied. ~~ In case you missed the date (because I failed to point it out), Find A Grave (top left) says Margaret passed away in 1935.
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Three Quarters & Counting 
Holy Moly, that cemetery has lot of Mohlers. Seems to be a super common name in the area. Margaret and Mary are such close names, and then you get daughters named after mothers or who use nicknames, or their middle name. And don’t even get me started on census takers who couldn’t spell. You must have gone through several sheets of not paper keeping that family straight.