This is the 18138th most frequent Russian word.
худеет
"Losing weight."
The word 'худеет' is used to indicate that the subject (она - she) is in the process of losing weight, referring to a continuous change in state.
Она заметно худеет за последнее время.
She has noticeably been losing weight recently.
In this conditional context, 'похудеет' suggests the future projection of weight loss as a result of the described action.
Если он продолжит так много бегать, он быстро похудеет.
If he continues running so much, he will lose weight quickly.
Here, 'худеет' is used in an interrogative form to inquire about the process of weight loss among other individuals.