The sentence that requires semicolons instead of commas is:
"Miss Rachel will teach basic ballet movements such as a pirouette, or a spin, a jete, or a leap, and a reverence, or a bow, to her beginner-level classes."
This sentence lists multiple items, some of which contain internal commas, making it necessary to use semicolons to separate the main items clearly. Correcting it would look something like this:
"Miss Rachel will teach basic ballet movements such as a pirouette; or a spin; a jete; or a leap; and a reverence; or a bow; to her beginner-level classes."
This way, each option within the list is clearly separated.