It depends upon the student's skills and abilities on the keyboard. I am not quite sure about the *skipping grades* concept. I feel that technique, theory and skills that is introduced needs to be done step by step, in increments, so to speak. Some students excel quickly than others. If a student progress at a rapid rate, it may seem feasible to skip a grade. For me I am not familiar with that, so I may not be of help to you, meli. But, do what you think is best for your student and that she is comfortable in the grade that she is in; I think that would be the most important issue to look into before considering skipping a grade to save cost and time.
best wishes,
go12_3