Can anyone recommend a good book for an adult whose mother has cancer?

My cousin is 38 years old and her mother has been given only a few months to live. Her one sibling passed away, so she is technically an only child now. She has not had a good relationship
with her mother who has suffered from addiction to prescription drugs over the years. My cousin, however, has been a stellar mom
to her own three children and a great wife.

Anyway, now she is faced with caring for her mother and going through conflicting feelings. She does love her mother and has
been attempting to heal the chasm between them through talking
and forgiveness. Her mother does not want to even muster the
energy to fight which is very hard for my cousin. It is doubly hard
because her mother is only 58.

Can anyone recommend a book for women whose mothers or parents are dying of cancer? There are a lot of books AFTER the
death, but could not find anything about coping with a dying parent
(except for children).

Any book recommendations would be greatly appreciated.

Thank you so much.