Hi Helen,
It didn't occur to me to look for Martha in an orphanage, as she had many much older brothers and sisters, until I discovered that Martha's own 3 youngest daughters were placed in an institution after she died and an "aunt" moved into her house with her own children, forcing several of Martha's out. That's when I realized that family solidarity was not always to be counted on!
Thanks for the book info if you come across it. I hope you find Emma Jane and Elizabeth Ann Hunt : are you just trying to find out what became of them or searching for their descendants? I know what you mean : I suppose if you don't have something to pinpoint them with, it must be very difficult.
I hope to find out what led Martha to go into another institution, the Devon house of mercy, afterwards, but that may be harder to discover.
Best wishes,
Alan