Board Thread:Naruto Discussions/@comment-27654795-20161130001821/@comment-734582-20161130172219

In a sense her power is virtually infinite. But she's a princess who never fought anyone of any serious level. The only people she ever truly fought in her life were the humans fighting wars.

So even though she has insane power, she's ironically fairly weak.

But yes she is planet-busting level, easily. SP:CT can create a moon, and that wasn't even the limit of that jutsu's power. Kaguya is beyond that by quite a margin.