[NI0271]
"...the eldest, Mary, Mrs. Lovell, seems first to have come with the Coleridges (to Greta Hall) but to have outstayed her welcome. But she returns with the Southeys in spite of Coleridge's advice that she should be pensioned off, lived all her life there and ended her days at the age of 91." source; Greta Hall by H. W. Howe, p. 23
Page 110 says that Mary (and Kate Southey) was living with Cuthbert Southey at Underskiddaw in 1855