Shi simply wanted to go out and kill things and get paid for it. She needed new materials in order to remake her puppets after her last sparring match. Getting to use Shirogane’s puppet showed her staunch weaknesses in her own puppets so now she wanted to revamp them. She couldn’t have her tools of destruction be anything but the best.
This was far from her first mission although she typically hated going on them. She hated that many of the missions required having other people accompany her and most of the ones she could do alone were beyond remedial. Shi did not become a shinobi to look for losts dogs and children. She wanted to be stronger so she only went on missions that she was certain would involve conflict.
The white haired girl would approach the gate of Sunagakure in her black cloak. Her hood was down only so that she could be identified by whoever she was to be paired with. For her, this was the worst part of the entire mission. Her gaze was simply ahead, waiting for when she could head off to slay scorpions.