Rory,
The scant information available about Eleanor Poulett-Harris' teaching career and the school she founded is now available here if you are interested:
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=46233919
This is a (very) informal summary of the findings of a more serious research project into teaching in colonial Tasmania.
I hope you find it of use/interest.