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,