19.1.1808 Mrs Hutton calls
This was the only instance of the name Hutton in Godwin's diary, so it's hard to make any definite identity, but I think it was quite probably Catherine Hutton DNB 1756-1846. She was unmarried but aged 52 so it would be normal if a little old fashioned for Godwin to call her Mrs Hutton. Her novels had not yet been published. Read her DNB article and judge for yourself. There may be among her letters and diaries at Birmingham something which could confirm or deny my guess