Right. Let's just say Kurama decided to be a kitten and let Naruto suffer injures for months as a lesson. Sakura after seeing him once already went to Tsunade to ask her to train with immense guilt over the injures he received trying to keep his promise to her. If Tsunade was taken care of him personally because it was that bad. whether she brought her along as part of her training or kept her away because the injuries were that bad. It would compound the guilt Sakura feels every time she saw him.
She wouldn't fall for him because of that. The repeat visit/care and seeing the dmaage would compound the horror that Sasuke could injure Naruto to this extent and the guilt she feels for sending him off.