The calcified granuloma
is the most probable cause for your mother's seizures. As far as the granuloma itself is concerned, it in all probability does not require an operation to be removed. The treatment is with anti-convulsant medication which are to be started. The headache is unlikely to be caused by the granuloma especially of it is a small calcified granuloma with no pressure effect on the surrounding brain. The neck pain
is unrelated to this. Both will need a careful evaluation and management.