Ok since she thought about the others girl words about her own future, then i can only think of two situations ,1) is that she doing this to rush progression and be done with him to think about herself, her future.
2) She thought about her future with 'him' even tho this may would happen in future in series, but if this was the case , it felt sudden and rushed. idk ¯\_(ツ)_/¯
They'll start dating? Is that for real?? If it's just for the sake of rushing Shintarou's improvement, I think that's not good. She should think about it more carefully.
