Hello Denis
I saw your query as I am a volunteer in Co Offaly and your post had Offaly linked to Longford. Is there any reason for this link I wonder? Anyway I had a look at your information and could find nothing at all for the of Ellen, Mary Frances or Annie at all in the 1860's. Could find any record of marriage Annie to James Miley. Found 2 Anne's married to a James Miley in Longford but neither had the surname Malone. Is there any possibility that the 2 ladies who went to the US changed their surnames? Have you the ship records from when they travelled? The source for Fanny's death you attached brings you to an application form for a record at NYC but has no details on it. It is very unusual there there is no record of any of the 3 girls at allwith those names or dates. Sorry I cannot be of assistance. If you have any further information it might assist in tracing your ancestors.
Margaret