Keyframing depends on how much control you need.  more keyframes , less interpolation.

I would try just two keyframes

frames 1 and 30 with the feet close together but parrallel;  like | |  

then frame 15 with feet twisted , like /   as the heel click.

I would try thigh rotation first and if that wont do it try twisting of the shin.

It might be a combination of foot twist with a shin or thigh side movement.

Once you have it copy frame 15 and 30 and paste at 45 and 60 and repeat for how many times you need the click.

If you want to be fancy the figure should raise on her toes a little for the heel click. Stand up and try it to see.