If your daughter is taking BC as a sophomore I would think it means she is very good at math and my understanding is that AP Stats is not a very challenging course for kids that are mathy. Not sure about the rest of her courses but going from BC to Stats would not be seen as a rigorous course load.

My son is a freshman taking BC and he will take Multivariable next year. He plans to take Stats at some stage but he does not really consider it a math course.