In 1901 some of family still in Llangranog, Cardiganshire
Evan Jenkins widr. 41
Elizabeth Jenkins dau. 18
Mary Hannah Jenkins dau. 12
Ann I saw was working as a servant somewhere (didn't note details) but couldn't find David William.
As you can see 'Eliza' has become Elizabeth in 1901 and Mary A. is Mary Hannah - by next census dau's. Ann and Mary Anna living with him plus a 2yr. shown as dau. but probably grand-daughter. Evan still a widower.
So, Eliza is Elizabeth and still living at home in 1901 - but which is her correct forename??
However, be it Eliza or Elizabeth, if she left home for work after 1901 she could have gone anywhere and trying to find either a likely marriage/death extremely difficult as such a common set of names.
Annette