She lets the string go taught without shooting the bow. Really, this is actually slightly embarrassing since she work's pretty much exclusively with bad ass archers and fighters. She offers him the bow back.
"Yeah." It's a concession of defeat really. He could use that bow so she wanted to show she was just as bad-ass. Instead she had to concede defeat. "Maybe one of those Nerf bows with the suction cup arrows." She's not being serious, just a tiny bit self deprecating without trying to show it.