Welcome and congratulations on Macy! I hope she brings you lots of happiness over the years.
I agree with Paige on not vaccinating all at once but spacing out treatments, it seems you have a sensitive individual there so any future vaccinations your vet may wish to hold her for observation for a few hours afterwards...
In terms of type, it's hard to critique without pics that have them looking at the camera to be able to see eyes and earset and a body shot where they are standing. Her coat texture looks good to me, we don't want a slick or shiny coat and more of a loose, non-resilient texture. I also see good dark spotting and ocelli (light "eyes" on the back of her ears) which we want too. I suspect you saw BST and misinterpreted that as SBT (it's a common mistake). One means "brown spotted tabby" and the other "Stud Book Traditional" which as you've worked out is not possible at F2.
I would say it is unlikely she will be a huge cat, the females almost never grow as big as the males. There ARE exceptions though and she could be one....and not all males grow large either. I think Joy has been using some Maine Coon in her program a while back which would possibly add some size to her kittens... my very first breeding cat came from Joy but her father was a Serengeti and she was not a large cat. She was properly proportionally tall and I still think very typey as an F2A but I think made only 11lbs at adulthood...
