How did buds mother die in bud not buddy?

In "Bud, Not Buddy" by Christopher Paul Curtis, Bud's mother, Angela, died from what is implied to be a combination of poverty and the struggles of single motherhood during the Great Depression. Bud reflects on her passing as a result of a traumatic and difficult life, exacerbated by the loss of her family and the challenges she faced. While the exact circumstances of her death are not explicitly detailed, it is clear that her struggles had a significant impact on Bud's life and experiences.