Hi Val,
Looked at the baptism for you today:-
Mary Gill born 21 Dec 1778, baptised at Thirsk on 4 Feb 1779, daughter of Thomas Gill, weaver, junior. Mother's maiden name: Elizth Kirton.
I also noticed Ann born 11 May baptised 25 November 1781, daughter of Tho. Gill Junior, labour, mother Eliz. Kirton.