Hello Vicki
I have your grandmother Amy E Cowin in my tree!!
I have been researching my family name of Callin for a few years.
In 1778 Robert Callin married Ellinor Cowin in Patrick (Foxdale) and I am one of their living descendants (my mother was born a Callin in Douglas in 1919).
The Elizabeth Callin you mention was their great granddaughter (her father was William Callin and his father, in turn, was Joseph Callin, eighth named child of Robert & Ellinor)
I live in England but visit the Island and my family on the Island at least once a year.
Please contact me to discuss further.
Paul Draper
p.s. My info on the Cowins of Tenterfield NSW was mostly supplied by an Andrew Kingdom.