How much music theory does one need to know to take AP?

I sing and play basic chords on piano. I know basic music theory but I know how to sight sing. Would it be hard?

My D16 who has taken music lessons since elementary school and played in several orchestras and ensembles and gone to summer music clamps that include theory classes, is very concerned about the AP music theory exam. She is currently taking the high school’s music theory AP class and has an maintained an A but but was so stressed about the AP Exam that she started taking weekly Music Theory lessons from a private tutor a couple of months ago. I know of a local homeschooler that was awarded a very generous scholarship to UT Austin for classical guitar that did not pass the music theory AP.