Emily Dugger married in Gallatin Co., IL. That is the only thing linking her to Dread Dugger. There may be other proof that she is Dread's daughter, but I'm not aware of any.
Emily and family were in Greene Co., IL for the 1850 census.
7th Census of the United States - 1850 Name Age Sex Race Occupation Real $ Birth Place
Greene Co, IL - Between Macoupin & Apple Creeks
Page 39b, House # 518, Family # 520
Augustus Kirwan 25 M W School Teacher 250 VA
Emily Kirwan 20 F W TN
Daniel Kirwan 2 M W IL
George W. Kirwan 4/12 M W IL