Question

Do you think that Johnsy was talking nonsense ? or did she have some forewarning that she would die?

Answer 1

Yes, Johnsy was talking nonsense about her dying after the last leaf falls off the creeper outside her window.

Explanation:

She was very sick and suffered pneumonia so she felt horrible and didnt have the will to live and therefore the doctor couldnt help her since the only thing that would help her is her own will to live