Hi
Don't know if this is going to help a great deal but here are the Warings in Prenton 1841, where I believe your Sarah was born.
HO107-128-16-Page 24 Prenton Woodchurch Parish
William Waring 40/45 ag lab born in county
Mary 40/45
Ann 8
Elizabeth 3
Thomas 1
next page (25)
Thomas Johnson 35 farmer
Jane 25
John Waring 10 male servant
Sarah ~ 15 female servant
Elizabeth ~ 20 ~
going by the births in the CPR there should be another William and Mary + family in Prenton but there isn't, I search through all the townships in the Woodchurch Parish but did not find them, sorry
peterbennett