You're doing a lot of great things already to help her -- please pat yourself on the back! And you're also aware, I can tell, that you don't want to over-emphasize K too much right now or it will loom too large in her imagination over the summer. The books and school supply shopping etc. are all great.
You said you'd taken her to the new school "to visit," but was that just a her-and-you quick visit, or has the school had an orientation day for all kindergarteners yet? That may still be to come since it's still July. Check to see if one is planned. Many schools have kindergarteners come for a brief time, maybe two hours or so, one day before school begins to visit their classrooms and other areas (library, cafeteria, gym) and meet their teachers; these orientation days sometimes include a brief, fun activity in what will be their classrooms in the fall. If your school does not plan any such orientation day -- ask if they will! It puts your child in what will be her own classroom (she'll see all the cool new toys, games, chalkboards, painting area....) with other kids who will be in her class. For some kids seeing the places like the kid-friendly library is a big eye-opener that "this place is for ME and it's fun."
If the school doesn't or won't do an orientation half-day for kindergarteners, then see if you can arrange a "kindergarten play date." (Our local school organizes both things for parents, actually.) Find parents of other kids who will be in that school for K and meet on the school playground for a while one day -- the kids will get to explore a new playground with other children from their class or at least their grade. I don't know how to locate those parents, though, because at our school the K play date is organized by the school itself.
She likely isn't really scared or intimidated by kindergarten itself but by the prospect of leaving behind what is very familiar to her at her preschool and preschool camp. She may have some initial mornings where she is resistant but if her teachers are even halfway decent they will know how to get kids right into their kindergarten day and distract the heck out of them until they love to go there. And in the summer, of course, pure distraction is fine -- get her play dates with any friends who are going to be at her school but without talking about school; take her somewhere she hasn't been before; etc. The fact she is so aware of what's coming means she's probably very bright and aware of herself and her surroundings which is actually great!