Rachel Ross (Hamburg) - Rachel Ross(Hamburg)

Not sure how much it matters.
On their marriage document on the Nova Scotia Historical Vital Stats site she gives her age as 22. https://www.novascotiagenealogy.com/ItemView.aspx?ImageFile=22-369&... which is drastically different from the other two documents.
A possible match for her immigration supports the c.1887 date.

If you check the 1901 Census again, it's not just Rachel. We see her father's birthday is given as August 26,1863 not November 1862 as was thought(see Geni), Esther...September 17,1861 not July 25, 1862 as thought, Sophia..December 14, 1883 not September 4th,1884 , Israel ...September 4th, 1889 not September 29, 1891, Barney Feb.29,1891 not c.1893 as was believed. This late date is the giveaway though. That's because 1891 was not a leap year! So all the dates in the 1901 census are now under a bit of a cloud. And the mystery deepens. What was the reason for the inaccurate date(s)? Maybe as immigrants they simply couldn't communicate well? Maybe everyone (except the father) wanted to seem older for some reason? In any case, for now it's probably better to keep the Geni dates (including for Rachel) as is.

The more time you spend researching and reading these documents, the less remarkable this will seem. If you want to keep track of all the variations, I suggest that you add the details within the person's 'about' section on their profile page.