I couldn't find an image with the Simpsons Barbie doll and the title.

But I did find this:

I believe Malibu Stacy also says Math is hard.

And "Now let's forget our troubles with a big bowl of strawberry ice cream!"

 Lisa: A hush falls over the general assembly as Stacy approaches the

       podium to deliver what will no doubt be a stirring and memorable

       address.

        [pulls Stacy's cord]

Stacy: I wish they taught shopping in school!

 Lisa: [groans, pulls Stacy's cord again]

Stacy: Let's bake some cookies for the boys!

 Lisa: Come on, Stacy.  I've waited my whole life to hear you speak.

       Don't you have anything relevant to say?  [pulls cord]

Stacy: Don't ask me, I'm just a girl.  [giggles coquettishly]

 Bart: Right on!  Say it, sister.

 Lisa: It's not funny, Bart.  Millions of girls will grow up thinking

       that this is the right way to act -- that they can never be more

       than vacuous ninnies whose only goal is to look pretty, land a

       rich husband, and spend all day on the phone with their equally

       vacuous friends talking about how damn terrific it is to look

       pretty and have a rich husband!

 Bart: [pause] Just what I was going to say.

-- Shyeah, right, "Lisa vs. Malibu Stacy"