You could well be correct about Mary being the dau of William Corteen (1767-1839 according to CR), and Mary Kirmeen, bapt Maughold 27 Mar 1803, as both Marys were from Thallooqueen.

Perhaps the 1851 and 1871 censuses would help with an exact age for her? A mention of her children in a sibling's will would be good!

William CORTEEN aged 72 of Thalloo Queen buried May 10 1839.

John Kinrade is even trickier, with no obvious John s/o John b. Andreas until 1824.

Sue