Hi there
So, from your research that you have already done, was Jane's maiden name WATSON ? If so, then it would be worthwhile you spending some pennies on the death certificate for a Jane Harriett INGRAM who died in 1897 in Queensland.
Qld death registrations are very informative. They are not like English ones. Qld death registrations include details about the person's parentage, and their marriage and the children of the marriage. And one of the other details is the answer to the question "how long in the colonies". Armed with the answer to that question, you can then start to search through the immigration records that each of the six separate colonies (now the six states) hold. It is very likely that Jane INGRAM's husband provided the information on her death registration, so IF that is your family, then his information is likely to be accurate.
Cheers, JM