Re: The little girl had suffered enough already.
I'm not a doctor but I believe leukemia is cancer of the blood. The cancer could spread to other parts of the body, and she could now have bone cancer, but I don't think you can say that leukemia had reached her bones.
Please tell me you're planning to write a cheerful, upbeat essay or novel next. Some of your posts are really very depressing; possibly they are made more so by the current global situation.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.