Death not hers, just found her in 1921 age 62 (1859) b Pentir, Caernarvonshire, same address 5 Mount Pleasant.
William John & family living a few doors away on census at 3 Llain, Wain Wen. 1939 he is living 5 Mount Pleasant, so likely death for Grace between 1921 - 1939
Possible death in 1924, Bangor age 64, but would recheck. Age only as good as informant knowledge.