Call and describe her level rather than reading the course descriptions, because most schools will place her honestly if you ask directly. Anyone who insists a working tech must repeat the beginner content is selling seats. A gel nail course focused on structure and extensions is the natural next step from where she is, and Why Not Nails in Brooklyn runs that as a separate course rather than folding it into the basics. Small groups matter more at this stage than at beginner level, since the corrections get finer. Have her ask what the class works on. Real models rather than practice tips is the answer you want.