I think she is better off taking high school Physics than AP Bio, lest she wind up needing to take college Physics without having done high school Physics. Premed requires college bio, college physics, and two years of college chem.
I hope that she is also planning on taking a standardized test. I believe that colleges really feel more comfortable with admitting homeschooled students with high SAT/ACT scores, to confirm and validate their homeschooled transcript.