I haven't done Step Max in a LONG time, but it seems like you are talking about Maria.  She was in several of Cathe's earlier videos.
Maria is still a background exerciser in many of the CIA workouts.  In one of Cathe's earlier videos, I remember Maria being in the warm up and then the cool down.  Someone said that she had just had a baby so that is all she could do.  I think it was in Step Heat.
Cheryl