A gas lighter than air allowing for easier humanoid flight

Okay, so my character is relatively short (5'6 feet). Her bones are hollow,but similiar to a birds-very dense to make up for strength. Her wingspan is 16 feet. I want her to stay as humanoid as possible. What I'm wondering is if a gas such as helium or hydrogen (or any gas lighter than air) were inside of the hollow bones, would that allow for less muscle density and easier flight? What would the advantages and disadvantages of it be?

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A gas lighter than air allowing for easier humanoid flight

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