I know it maybe a repeat thread, but I just want to ask something...
Canonically, Kaguya have a bunch of stuff that she collected over the millenia. One of which is the flag that human have planted on the moon. The flag missing in SSIB and the fact that she have it may not be related, since there're 6 flag that human have erected on the moon, and they could be two completely different flag.
...But the problem is: These 6 flags have been planted by the Apollo program in the span between 1961 and 1975. If Kaguya always live in hiding in this span of time, then how the hell does she have it when she isn't going out even once? We know that they would be too fearful to goes to the moon, and the last time before the game is centuries ago. The fact that she just suddenly remember that she have it is suspicious too.
...Could this possibly have something to do with her manipulation of instantanious? Since she have no way to know what inside these moment, she could have use this time to collect these thing without ever knowing that she have collect it, and only have the "effect" that she have these thing.