Hello! My name is Dr. Aida and I am glad to attend you on Healthcaremagic! I understand your concern and would agree with her doctor that the situation is not lifethreatening. If she is experiencing persistent neck or head pain surgery may be needed. Regarding the lower part of the brain which is bulging under the skull, this is called Chiari Malformation and it is not a serious medical condition. It is often an incidental finding without and clinical symptoms. Hope to have been helpful to you! I remain at your disposal for any further questions whenever you need. Kind regards!