The 1881 is free to search here
https://familysearch.org/search/collection/1321821
I note from your previous posts that the names vary as does the spelling so would suggest you search just using one of the children's christian names/birthyears etc and omit the surname from any search
Thanks for the tip. She is the only person missing from this census but I can't find her elsewhere. She definitely didn't die as she is in the census ten years after.