She will spread her wings on her timeline. If being with some people she knows works for her, that is all that matters. Remember, happy kids do better in college than unhappy kids.
My older kid went to college where a couple of HS alums went. He never…repeat…NEVER saw them. He could have if he had wanted to, but the college was sufficiently large that there were plenty of new students to meet. Arizona is not a teeny school. There will be plenty of students not from your high school who attend there. Your child will find her tribe…be it with HS friends or new friends she meets. Either really is fine.
My younger kid went to a college 3000 miles from home where no one for her high school had ever attended. Actually, they never heard of the school. She was very excited about meeting new people…and I think this is key. It sounds like your daughter is on the fence about that. Anyway…my second kid said the first couple of weeks she was very homesick, and it did take time to establish her excellent circle of friends.
I guess what I’m saying is…if your daughter loves Arizona, she will have the option of meeting new people as close friends…or not…and it will be her choice. Also, even IF her friends attend with her, she may find that many of them branch out, whether it is because of their majors, activities, etc. And she probably will branch out too.
Does your daughter do any activities that are NOT part of her high school…where she gets to interact with others from different places?