Thank you Frian. I think that narrows it down to Ann of Milnthorpe dying in 1851, age 90. Ann Pearson Cornthwaite was 80 during the 1841 census, so she'd be 90 in 1851. I'll have to look at the 1841 census on Anc. at the library to definitely rule out the other Ann, but the 1851 date is looking good.