Interesting thread via Bill Andrews, someone suggesting that another black student was here same time as Fannie, her cousin, an Eva White? I did eventually see an Eva B. White registered for Sept. 1872, after Fannie. Eva is supposed to be a daughter of a sister of Fannie's mother Harriet who lived with them. There is a mention in Hendrick's book about a couple of relatives of Harriet's living with them, not much more. There seems to be some connection to the Page family as well.
Very good subject for a student intern, to research the black families of 19th century Brockport.