There are 3 Sarah Webb BMD entries
Deaths Mar 1847
WEBB Sarah Henley T 16 78
WEBB Sarah Bradfield 6 137
WEBB Sarah Reading 6 212
The Henley one died in December 1846 was 9 months old. She was buried in Sonning.
The Reading one was 84 - a bit too old? Buried at St Laurance, Reading.
Which leaves the Bradfield one, aged 43, unusually young to marry in 1819, buried at Beenham (St Mary) on 7 March 1847.
None of them seem a very good fit.