She is the "voice" of the baby in the sandbox who says "I don't get it" when Mikey tells the joke "How many babies does it take to screw in a light bulbWhat's a light bulb?
She was an editor in this movie so, I am guessing she would be close to 50 by now.
Editors usually don't have their pictures posted on IMDB, unless they also have some acting credits.
Unless an actor does only voices in movies like this one and cartoons or does movies like the Incredible Hulk and have a lot of makeup/masks, for the most part the actor looks like they do in real life. Why do some not have a picture on IMDB, just have to get a picture from a movie they are in.
I have 2 sets of twin boys, Pete & Repete and Mark & Remarkable

she was not the girl. She dubbed the character. She is the film editor of the film.

she's an editor that has worked om various films