http://freespace.virgin.net/jill.farndon25/R.html
This from Clwyd Family History Society seems to be a reference to the same Margaret Rimmer:
RIMMER 30 Wrexham: George;
353 Pentrobin:
358 Holywell Town Cemetery MIs: Denis;
*363 Wrexham: Margaret Rimmer WILLIAMS
*375 Wrexham:
13 Mar 1878 bap/o Edward Llewelyn WILLIAMS
s/o Joseph Llewelyn (surgeon) & Margaret Rimmer, Regis Place
*393 Wrexham:
15 Mar 1881 bur/o Margaret Rimmer WILLIAMS, aged 32, Chester St.
Misc: Welsh Wills proved at Chester 1545-1858 (deposited at NLW): Margaret, Conway 19 Mar 1810
RYMER 314 Rhosllanerchrugog:
359 Rhosymedre: Anne, Thomas;
RYMMER Misc: Welsh Wills proved at Chester 1545-1858 (deposited at NLW): Richard, Holt Hill 1671