You did know, I presume, that Eliza, the 17 year old daughter, married John Nicholson the First Officer of the Lord Melville almost as soon as the ship docked in Australia!
Keith
Actually, Mariea,
I've had another look at the book, and Maria Ann is listed under the surname ALLEN too, and there are at least 7 or 8 full pages on her there.
It might even be an idea to get hold of a copy of the book yourself as there is so much info in there about your family members, especially if you live in Australia, where it would be easier to get hold of one.
Though I am more than willing to take images/copy and send them to you, as I said...