It is my understanding that NO ONE is dx'ed as PPMS until after one year.

The reason is to get a medical history. If it is RRMS, it can take that long for a more accurate assessment.

Plus, the nursing consultant at the MS Specialist said that women usually are in their 40's to 50's at onset and most lesions are located on the spine rather than in the brain.

Your doctor is probably practicing good medicine by starting you on a DMD.