Just came across this :
Arrived Tasmania 17 Feb 1843 on the Sir Charles Napier
Eliza Ann Snell , dairymaid , going to Mr Crombie , Sandy Bay, religion Wesleyan ,native place Tavistock , Devon'
also travelling : Susan Snell , Mary Ann Snell, Elizabeth Snell, all going to different employment and all from Devon.
This might be worth bearing in mind . Note there are no ages given on this list.