We need another pair of eyes on this for someone elses opinion ..
there are DEFINITELY 2 Harriet Bentley baptising babies at St Michaels church Coventry from 1846 to 1848 
Thomas Bentley baptised 27th feb 1846 at St Michaels - parents William and Harriet 
Anne Bentley baptised same day - same church - same parents ( possible twins ?)
My personal opinion is that these next 2 children are to a different Harriet - no father named 
Harriet Bentley baptised 8th May 1846 same church - parent Harriet Bentley  (3 mnths after the above baptisms )
Ann Bentley baptised 3rd November 1848 -same church -parent Harriet Bentley 
So you have to discover which of these 2 Harriet Bentley died in sept qtr 1849 ....

Williams wife ?....or what looks to be a single mother named Harriet Bentley 
As of yet - you can`t know which one it is can you 

..if so I am missing something ...
any other members see any pointers that may have been missed ??