Board Thread:Versus Debates/@comment-30966312-20180413200754/@comment-5407586-20180818141121

Kinglink15 wrote: @Soloking Itachi. It seems you fail to understand that she still got exhausted in her battle against both Naruto and Sasuke, she can't recharge Chakra from the tat dimension, Black zetsu has proven this by telling her that she needs to return to earth to regain the chakra she wasted. Kaguya was "exhausted" because she overused Amenominaka, which requires a huge deal of chakra. If she can't use it, then she gets exhausted way more slowly. We don't know how much chakra is required for her other techniques, but it's safe to say that Amenominaka is the most chakra-taxing.

Kaguya can recharge chakra in the core dimension as well, not only on Earth. See when she managed to regain control of the tailed beasts to create an Expansive Truth-Seeking Ball.