If she is intelligent but not highly motivated then a competitive school is a great place to be. She’ll be positively influenced by her peers.
If its an academically competitive school than they are likely to offer a couple of post Cal BC classes available for advance students.
When it comes to highest ranking schools, there are no guarantees even for perfect applicants. As you are in Texas and have only one Ivy peer school there, start showing demonstrated interest by visiting, corresponding and taking summer classes there.