I am wondering if this Margaret O'Halloran came to Victoria on the Lady Kennaway in 1850. I have Michael O'HALLORAN, who was on this ship, along with Denis O'Halloran,his wife Mary and son Charles. I believe Denis and Michael are brothers or half brothers. My gg grandfather Charles O'HALLORAN from Formerla, Tulla, county Clare is another of their siblings.
Let me know if I have the same Margaret. I am happy to share the information I have and maybe we can find a link.