20 years? how about 58! :P
I was wrong with the 1958 starting year, it actually started in 1952
at has over 16000 episodes X_X
I'm NOT going to plow through those eps, not even for michelle, not even knowing that I have to look in the 80's/90's period (IF you can sort those out)
though, when you find ANY info on the internet, concerning the (number of) episodes she appeared in, please post it in this topic!
it will only bring us closer to the ultimate michelle filmography list!
though, it's out there:
she was in the 1987/1989 episodes (as far as I can find), which consist out of 18 episodes