The Sims 3: Earn 10,000 Simoleons?

I imagine this is a cumulative goal, not something that she has to do all at once. Just keep at it and it will eventually be granted.

Short of that, the fastest way I've found to make money outside of careers is by writing novels. Once you've mastered it, you can pump out a novel a day for an insane amount of royalties.

You can always use cheat codes to make money which makes the game lose all its potential and fun in my opinion.

Other than that, you can make money by selling things like paintings, novels, handmade stuff.

Play the Real Estate game. Become a partner in all the shops and stores in your town. Every monday you can collect rent. After a few weeks of this save your money and buy out the properties. The money you collect from owned real estate is awesome. That 10,000 mark is only beginning, wait til they ask you to reach 100K, 500K, 1mil =)

You could also collect rocks, cut gems, etc but I like real estate cause you can do 1 rent run every week and pull in like 50K in 2hrs