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The moment Xijun showed a fraction of her power, the world was submerged in an ocean. Even herself didn't thought a much out of it, perhaps because her old grandpa was even more of a monster than her, and I could bet that the two had fought before to the point that Xijun was made to think of her power as being "not enough" or "little" in comparison to the vast world outside, which her mysterious grandfather always spoke about being vast and mysterious, and filled with wonders and dangers.
But what she showed to everyone was the proof of our misunderstanding, we were actually pretty strong compared to the usual people here… even if they were all gods.
Check "The Protagnist's Sister Is Actually the Strongest"!