I would tell her to research all information. check to see the qualifications necessary to enroll. A married, and retired couple can only claim 1 or the other's medicare benefits, whomever made more money annually (per year) is the person who has the higher benefits..
An individual who is entitled to Part A or enrolled under Part B is eligible to enroll in a Medicare prescription drug plan. As long as Mrs. Mulcahy is entitled to Part A, she does not need to enroll under Part B before enrolling in a prescription drug plan.