I can find no burial at St Martin's for Ann Fowler in 1852, so I wouls guess that it is a different church - or a cemetery. As a first step, you could ask Wendy if she can spot Ann at Warstone or Key Hill.
There is however a burial for Joseph Fowler (Green Street, aged 5 months), buried Sept 16th.
As far as I know, the only way you will know who registered the death is from the death certificate. That information isn't held normally on the burial records.