Answer: Roberta has cancer and decides not to tell Willow about it.
Explanation:
James "Jimmy" and Roberta Chance find out that the small dent on the left side of her chest was a tumor, and she had cancer. After hearing the news, they sat on a wooden bench outside the hospital, and she tearfully decides not to tell Willow about it before it was over, so she can keep her focus on medicine.
