Hi Danielle! Grams sounds like a fun gal! You'll be able to accompany her into
The Pirates League even if you're not getting a makeover yourself. (You both will, of course, need to have park admission tickets to enter the Magic Kingdom, but you won't need to pay a fee to watch and photograph her makeover.)
My son had a makeover at The Pirates League last October and my husband, daughter, and I accompanied him to watch the transformation. The pirate who gave him his makeover was so funny -- my husband and I had tears streaming down our faces from laughing so hard at the jokes he made while he transformed our son into a pirate. (I think we enjoyed the experience even more than our son!) After his makeover, the whole family was allowed to accompany him into a secret area as well. (I won't spoil the surprise for you and Grams!) By the way, I bet once you see her makeover, you're going to change your mind about wanting one too!
Have a magical vacation! Come visit us again at the Moms Panel if you have more questions! We'd love to help!