My son thought that AoPS Intermediate Algebra was easier that Geometry. He probably spent 1hour per day. There is no Alcumus required for the class, but we chose to do Alcumus in addition.
I think that an AP class is doable if it is a subject she is passionate about. My ds13 is taking AP Comp Sci A this year and is doing well. Make sure she has the math background for the Chem class, I think that AP Chem has Algebra 2 as a prerequisite. So you may want to start with the high school Chem class. Ds is taking algebra base physics and calculus this year and is planning to take AP physics c or CC physics, not sure yet. We had a hard time finding a test location this year, so we may opt for CC.