Bob makes a great point. Let the pro handle lessons but play along with her during practice. While I have taught private lessons many years ago when I was highly involved in teaching music, I decided to let my son learn from another as figured he would listen better. However, I occasionally played with him during practice (he didn't realize he was getting private lessons from me- just thought we were having fun. After 3 1/2 years he finally figured it out and now occasionally asks for help.