The reason that I’m surprised by 3 yrs of Physics in high school is that there is usually only one year of Physics class offered in high school that’s really at the college level - Physics C. Physics 1+2 are without calculus, essentially what used to be high school Physics. At my kids’ public high school, kids go straight into that, while also taking Calc BC. But taking 3 yrs of Physics eats into the opportunity to take other sciences, as you’ve noticed. I understand kid’s having to deal with the course requirements for the IB; If you’re in SLC, the IB program most definitely is the most rigorous high school program available, was a very wise choice.
If you’re in Utah, the U of Utah is perfectly fine for undergrad Physics. They can do grad school in CA or anywhere else. I hope that she will apply there as her safety, since it’s likely to be very affordable for her.
Speak with her school counselor, and make sure that they understand that they need to point out in their letter that she has satisfied the most rigorous foreign language level available, without coming from a home that speaks that language. She doesn’t have to mention the immersion program in elementary school.