That's her story.
While I'm sure she was legitimately ill, I find it hard to believe that she was unable to have her own child live with her and her parents.
That whole thing was simply not natural.
Well, since it involved taking the year old child out of the country, there might have been bigger hurdles than a typical custody case.
We don’t know the details, but it is true that she was very ill. Maybe she put her desired second to the wellbeing of her son. I don’t know how old her parents are, or if they were capable of caring for their ill adult daughter and their very young grandson.
She left him with his father. There’s nothing unnatural about that.