okey doke, let's step back a moment.
To put it bluntly, we don't know which Elizabeth Blades this was, and there's more than one possible candidate.
OP, where did you find the Mather-Blades marriage details? (edited - answered my own q - on FreeBMD)
however there was also the Blades-Upton marriage mentioned above, and a total of 5 Eliza/Elizabeth Blades in the county in the 1891 census. It could have been any of these -- or none!
The Eliza Blades in Snenton in 1891 (geographically the most likely candidate but only because she was in Snenton) was 44, b Nottingham, a lace clipper, married (but not with husband) and living as a lodger with Eliza Horsepool in Snenton. I'm going to go and look for her with a husband to see what her m/name might have been.