Michelle Stacy was 6 in The Night That Panicked America when she played the character 'Hank Muldoon's Daughter (uncredited)'.
That was over 49 years ago in 1975.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 56, and has starred in 14 movies in total, 13 of those since The Night That Panicked America was released.
In The Night That Panicked America, I think Michelle Stacy looks: