Her debt would finally be repaid--with interest; the money she received from the sale of her share of Sunset Towers would pay for the education of another youngster, just as Sam Westing had paid for hers. (28.8)
Judge Ford didn't become a legal arbitrator for no reason – she really is a good candidate for being a judge. Here, we see her moral code of being fair and equitable applied to her real life situations, just as she probably applies it in the courtroom. Her sense of fairness and justice, of what's right, makes her uneasy about accepting an education and not giving back anything in return. When she becomes Chris's benefactor, she's paying Westing back in the best possible way, carrying on his tradition of mentoring young people, and turning the bitterness she feels at having this unpaid debt into the good deed of enabling education.