Lula's parents were William McMahle and Celmona/Seloma Summers:
Indiana Marriage Collection, 1800-1941
Name: Celoma Summers
Spouse Name: William McMahel
Marriage Date: 28 Oct 1858
Marriage County: Crawford
Source Title 1: Crawford County Indiana
Source Title 2: Marriages 1818 - 1880 Books A - D
Source Title 3: Part I Grooms Part II Brides Compiled by Ruth M Sl
OS Page: 340
Lula can be found on the 1900 census in English,Crawford County as Lou McMahel. According to the census, Lula was born in Jan or Jun 1879. It is difficult to decipher the handwriting for the month.
She married Edward Tillery after June 1900 in Crawford County. Book G page 307. You can write to the Genealogical Society or call the Crawford County Library and they can pull the marriage records to confirm all information.
If you have access to the Indianapolis State Library, you can access the information there.
William G. McMahel was the son of James McMahel and Rebecca Ann Jennings of Crawford and Dubois County, Indiana.
William was born June 27, 1832 and died April 16, 1884. He is buried in Grantsburg Cemetery in Crawford County, Indiana.
I have no further information on Seloma, but she may have moved to Gibson County and remarried.