Welcome aboard, Christopher!
I think I may have found her in this census record:
"England and Wales Census, 1871", database with images, FamilySearch (
https://familysearch.org/ark:/61903/1:1:VFNS-YST : 25 June 2022), Thirza Stalley in entry for James Stalley, 1871.
Your next step is to upgrade to family member. It is free to upgrade. Then you can start adding your family branches and digging into the research. After you have a few profiles added, come back here to the forum and post links or ID numbers so that other members can help you.
Good luck with your research and enjoy your journey into the past!