She married FITZGERALD as Margaret Elizabeth, not Margaret Rebecca, so she might have just been making up middle names if she didn't originally have one. The entry that Wivenhoe mentioned is for her - residence 10 years, ship Red Jacket, born Bristol.
The discharge on the 18 Jul 1878 has her birthplace as Bristol. The discharge on 29 Sep 1878 has no birthplace but the person above her is Yorkshire.
More replies but will post anyway.
Debra
