I have a record of a Jane Garrett, daughter of Thomas and Catherine (nee Black) Garrett. She was baptised in German Parish 13 Aug 1800. Other children were:
Thomas bp 15 June 1792, Ann, 11 Nov 1798, WIlliam 26 feb 1806, James 16 Mar 1809 and Margaret 24 May 1812. I have no other information but this may start things off.
Also from church records in St Peter's Peel: Jane Garrett (otherwise Crane) wife of Thomas of this town dtpd this life Dec 29th 1850 aged 60 yrs.
And here lieth body of Jane Garrett also Calley dptd this life 11 Dec 1776 aged 42 yrs.
Good luck!