1.  Marriage Record:

2.  1880 Census (indexed at FamilySearch.org; page image online at Ancestry.com, Image #3 of 26):  Spencer Twp., Kent Co., MI, Roll T9-0587 (Book 1), p. 401C, PN 3, SD 2, ED 110, enumerated 2 Jun 1880, official enumeration date 1 Jun 1880 (extracted by Diana Gale Matthiesen):¤•

1880:  for an explanation of the column headings, please see What the Numbers in the Federal Census Mean (missing columns contained no data).
1	2	3	4	5	6	8	9	11	13	24	25	26
25	25	Stroup Emily J	W	F	43			/	Keeps House	PA	PA	VT
		______ Maggie M	W	F	1	Dau	/			MI	PA	MI

It's odd for a widow in her 40's to have only one child so young.  Emily was only just barely young enough to have birthed Maggie.  Did she marry for the first time at 40?  Listed three households from Henry & Mary (SANDFORD) STROUP.