Were you hoping for her to get IB Credit for classes? Some colleges require that you get the Diploma to get credits. Some only give credits for HL classes. Check out what your college of interest does.
If she meets the 3 years of recommended science classes with labs she meets the UC requirement in that area and will be fine, especially if not a STEM major. Good luck!
Thanks for all the advice! D’17 did decide to drop the IB Physics class and I think she will be a lot happier.