I'm a cousin to Tammy and have been researching also. From what I found, Nellie did have a sister Emmaline. This is the info I have on her:

Emmaline Elizabeth Meeks
Born: 10 Aug 1880 in Jasper County, Illinois
Died: 12 Oct 1966 in Newton, Jasper, Illinois

IRAD has a marriage record for her as follows:
Groom, FILLINGER, ALONZO D
Bride, Meeks,EMELINE
Date: 1899-07-16
County:JASPER

Could this be your Emma?