I do not know as yet if Fiona is related to these Clare Snashalls yet.I have been able to piece these older family units together but haven't found a connection to the more recent Port Adelaide Snashalls yet. The 1928 marriage you found earlier was very promising and I will be following that one up.
I will go through the District Records now as they will give me more recent information. Fingers crossed!
I have found the Snashall's from Clare District arrived in SA on the Indian on 7/8/1849. There was a lot of sickness and death on board and complaints were formally made. Documentation for this voyage is available in the State Library if anyone is interested - Perhaps Liz if she see's it.