due to prematurity along with the defective development of her brain may have jointly produced fits
in your niece. In the given circumstances, I would strongly advise you to see a pediatric neurologist
instead of going to homeopaths. She needs expert clinical assessment before a plan is tailor-made to fit her problems. I am sorry to say this, but I am not so confident that she will be cured after 2-5 years, since she also seems to have other neurological problems and developmental delay.