Just tell her bluntly - you said she is blunt so she should be able to take your bluntness - that you could have seven rendezvous a week, each with a different young woman, if you wanted to, so her little assignment is below you - it is like having a Nobel prize winner in physics take the physics subject SAT. Further, tell her that the assignment felt condescending and disappointing to you at the same time. Then stop and let her do the work of thinking it through.