It is safe with tolerable side effects which include edema, skin rash, fatigue, and myelosuppression. Other treatment options include
hydroxyurea, interferon alpha, and stem cell transplantation.
The advanced phase and the blastic phase can be worrisome, but can still be treated.
At this point, it is very important that she regularly follows-up with her hematologist. There will be series of blood examinations to check how she responds to the medicine she is taking.
Good luck.