Caption appears to be wrong. Eliza (and Job) had 6 children (including twins) and at the time of the picture all 6 appear to be still alive.
No, I was mistaken, though the caption still seems to be wrong. I think the lady is Selina Brayne (formerly Grant, nee Tallis), Eliza's mother in law. Her husband Thomas Grant died in 1891 and she re-married in 1899.
Also I don't think she was 90, she was born in 1938.