What Does The White Spots As Seen In MRI Of Brain Indicate?

My thirty eight yr old daughter who has very mild case of c p has been experiencing extreme balance problems with anxiety about falling for a few weeks now. She just went to hospital and had mri done and the primary doctor called her to let her know that they see about 8 or 9 white spots on her brain indicating what he believe was symptoms of m s. She will be seeing a neurologist Mon. From what I understand the dr. is looking for the size and shape the the white spots. She has experienced sinus infections each winter it seems like and would get a antibiotic somtimes for the infection. Please answer what are some of the other symptons for ms diagnosis, and will she also need a spinal tap to confirm the diagnosis? She is a nurse s aid in a geriatric facility and has taken care of many of the worse of the worse ms cases.