What does this quote mean "I Stared a t the bandaged head. I didn't know what he wanted to confess, but I knew
for sure that after his death a sunflower would grow o n his grave. Already a
sunflower was turning toward the window, the window through which the sun was
sending its rays into this death chamber."

I think its talking about the fact someone is about to die from having a bad accident, which another character is trying to say what is going to happen to the grave appearance.

Explanation:

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."