This looks like a very good possibility for Margaret Conrad with her parents. She was listed as being born in Ohio in the 1860 census and born in Missouri in the 1870 census.
M432/419 Mount Pleasant, Scotland, Missouri page 150
Jacob Conrad age 55 male Farmer born Germany
Catharine Conrad age 47 female born Germany
Frederick Conrad age 26 male Farmer born Germany
Sophia Conrad age 21 female born Germany
George P Conrad age 19 male Farmer born Germany
Margaret Conrad age 11 female born Ohio
Barbara Conrad age 8 female born Missouri
Catharine Menge appears to be the mother of Margaret rather than her sister. The age here matches the age in the 1870 census for Catharine Menge. Also there is a 35 year age difference between the two.
Margaret A Wiese is listed in the Louisiana Statewide Index of Deaths. She died on Sep 20, 1915 at age 76 in Plaquemines. Volume 12 Certificate # 20377.
1910 census. T624/526 E.D. 56 Sheet 2B
8th ward Plaquemines, LA
Wiese, Mrs. Margaret A. age 71 female Widow born Ohio, parents born Germany
Wiese, Agnes age 33 Daughter Single born Louisiana
Right next door is:
Withan, Dave - Head age 50 male married 17 years born Germany
Withan, Emma - Wife age 37 female married 17 years born LA
Withan, Elsie - Daughter age 10 female born LA