I don't have full transcripts but a Daniel Kirk aged 71 was buried 6 Feb 1816 at Loughborough All Saints, and a Daniel Kirk aged 54 was buried 29 Sept 1829 at Woodgate Baptist Church, Loughborough.
Nottingham Review and General Advertiser for the Midland Counties 02 October 1829:
On Tuesday, an inquest was taken before C. Meredith, Gent, Coroner, at the Black Horse Inn, Loughborough, on the body of Daniel Kirk, gardener, aged 55, who, late on Saturday night, missed his way, and making a wrong turn, got into a manure hole, where he was found suffocated on Sunday morning. Verdict, accidental death.
If Sarah's family were Baptist it could explain her late baptism into the Church of England.
I can't see an Elizabeth but an Eliza Kirk aged 62 was buried 26 Feb 1842 at Woodgate Baptist, and on 11 Oct 1841 an Eliza Kirk aged 19. All other burials there are children.