Gaara I have no doubts can defeat Fu, but I think he will face a lot of difficulty if Fus Jonin join them to attack gaara
I think he's having a moment, that's all.I don't think Gaara will fight Fuu, and I think he is more worried about the Genin who have to fight her. I don't think it will be that big of a deal anyways, because it seems her and Chomei are friends already.
Remember, 6th Gate Guy soloes.Gaara I have no doubts can defeat Fu, but I think he will face a lot of difficulty if Fus Jonin join them to attack gaara