Hi Debbiewebby,
For what it's worth, my money is on Amy.
a. By 1891 Samuel is married* to a Beatrice, so I searched for a female Conduct death between 1881 and 1891 and in Dec 1884, and Amy Conduct dies in Droxford registration district, age 26
b. The 1891 and 1901 censuses show a Faith + Arthur Tilbury couple at Bishops Waltham (Arthur Tilbury was the 4th person on the page)

*or shown as married, at least. I can't find a matching marriage.