Doggone, I logged on too late! Well, I THINK I would have had it with the clue, but not before.
Denise is also on what I would say is the worst episode of the BRADY BUNCH, when Peter discovers a kid who looks just like him, and due to a mix-up he (Peter) ends up running between both girls in different rooms of the Brady manse. At this point, Denise was a late teenager and bookish with big glasses, but kinda cute.