Hello,
Thanks for your message via Rootsweb. While I know nothing about Sarah Rackstrow, my eyes perked up when you mentioned a burial in Eaglehawk Cemetery in 1872. Oh yes!!

'My' Margaret Rackstrow (married name - she originally Young) stated on marriage to Wm Bower Colquhoun that she was widowed in December 1872 which fits so neatly

Hopefully
B Milne tammydterrier@yahoo.com.au