Board Thread:Versus Debates/@comment-31559538-20180711211343/@comment-1512913-20180713174730

It was definitely the entire Otsutsuki Clan, not sure why people so much assume she referred to those 2/3 specifically. Hell in the Boruto, Momo, Kin and Ura stated pretty much that there are others out there.

Also it wouldn't make sense for her to fear the 2/3 but not the rest of the clan, for all we know, there might be dozens if not hundreds other Otsutsuki in the universe. At least their words suggest that the clan is well and sizable, having main and branch families in it.