Hi
This won't help with her maiden name I'm afraid but the baptisms are on the BVRI. Mother just shown as Elizabeth and no marriage on BVRI
CLEWER, Edmund Christening Date: 7 Jul 1825 Upper Sapey, Herefordshire
CLEWER, John George Christening Date: 28 Apr 1827 Bromyard
CLEWER, Henry Christening Date: 19 Mar 1829 Bromyard,