I think you mean she was 59 when she died - not 19
Where did you get her full birthdate from?
If she was b 1876 - that makes her 15yrs older than Edwin who you say was b 1891 - is that correct?
You need to provide more info & tell us what research you have done yourself so we don’t duplicate
You haven’t given any details of her birthplace nor any details of when or where they married? You say you “think” her father was Hugh - do you have a copy of her marriage cert confirming that?
No names or birthyears given for any of the 5 children you mention.
Have you checked for her birth reg on freebmd then looked on GRO online to get her mothers maiden name so you can find her parents marriage? Freebmd birth 1876 - GRO shows mmn Jones.
With surnames like Evans & Jones you need to be careful

“I have been told that Edwin or Mary”.
No birthplace given for Edwin so what research have you done yourself to establish a connection to Ellis Humphrey Evans. Given his surname - isn’t he more likely to be connected to Edwin - possibly a brother??