Yes, I slipped up on Elizabeth's death date, although I'd previously noted it. Perhaps her daughters Jane or Betsy, as far as I know the only survivors, made the notification. Do you know anything about Harriet, born 1835? I haven't been able to find any further information about her and assume she must have died young, but am finding it difficult to identify her amongst all the other Harriet Birds.
Incidentally, I found lots of references to Joseph B in The Era publication. In one he had advertised for a position as a theatre manager, mentioning his experience and skills as a songwriter. You may have already checked these.