Bertha Lewis was born in 1876 probably in Union County, Illinois. Her parents were William and Jeanie (Wilson) Lewis.
The only records I have for her is from the 1880 Census. She was with her parents in Stokes, Union County, Illinois.
Between the 1880 and 1900 Census she could have married, moved away or passed away. I have not been able to find a marriage certificate so I can assume one of two things :
1. Bertha is a middle name or not the name she went by when she was older. This could be possible.
2. She passed away in childhood.
On one final note, there are 3 possible marriages with the bride's last name being Lewis in the Illinois Database for her time frame. One of those is Jane Lewis. It is a possibility this could be Bertha.