Why was Katherine unhappy when Sam had completed all of the repairs on the school building in the book Holes?

In "Holes" by Louis Sachar, Katherine was unhappy when Sam completed all the repairs on the school building because she had hoped that the improvements would draw attention to her own aspirations and her desire to educate the children. Despite the repairs making the school more functional, her feelings were overshadowed by her unrequited love for Sam and the societal constraints that prevented them from being together openly. Ultimately, her disappointment stemmed from a combination of personal longing and the broader limitations imposed by their community.