Sue, thank you for these two.
To answer your last question, yes, I did decide that Mary Jane’s mother was Caroline because of being a granddaughter of George Looney in the 1881 census. George’s daughter Caroline married a Callow, so that seemed the obvious source of the Callow name for George’s granddaughter. Of George’s daughters, the first two, Mary Ann and Margaret, must have died in infancy, because their names were re-used. Catherine probably did too, as she is not heard of after baptism. Ann, who became Fanny, and then Frances, and the second Margaret, were spinsters, and the second Mary Ann married Edward Quayle. That still leaves Elinor, who was around until the 1861 census. She might have married a Callow too and had a daughter Mary Jane.
I don’t think the Mary Jane Callow born in 1879 to Jane Callow, is the same one, because of the age discrepancy, too wide for a child in single figures, and because George Looney did not have a daughter called Jane.
If we look at the birth place of Mary Jane, the 1881 census has Maughold, and so does the 1911, if Mary the cook is the same person. But 1901 has Douglas, a conspicuous anomaly among the Maughold folk. Any likely birth or baptism in Douglas? We would like her father to be Charles Callow, and her mother to be Elinor Looney.