Essential Toys for the Three-Year-Old Girl

I have done an informal highly scientific study with a test group of one, and have determined the essential toys for the three year old girl. Of course, kids tastes are completely individual, so my toy study may be of absolutely no use to you, but I  at least will know how to keep my three-year-old niece occupied next time she comes over to visit. Since she's the test group. 
Observing a three-year-old girl, or better yet, playing with her, is a great way to see what she's really into and how her mind works. If she's anything like my niece, her mind, of course, works at the level of creative genius. Here are my suggestions of the basic toys any three-year-old girl would enjoy. And really, with my niece at least, she doesn't need much more.

1. One good fashion doll
Not all three-year-old girls are into dressing up their dolls, playing dolls, anything dolls, so this is the first of many subjective things. However, it seems to me that one good doll of the Barbie, Disney Princess variety is a great basic item for the toy collection. I say one instead of fifteen because I realized a few things lately. One, I like to buy Barbie and Princess dolls, not necessarily for my niece, but, I just like to buy them. So, if I don't put on some controls, and say "She doesn't NEED another DOLL!" I will continue to purchase them and it's just a big waste. Or you buy one, and a Ken, and then another, and then SHE needs a Ken. It's a never ending cycle. And the companies WILL keep making more, they won't stop. So you need to stop yourself!  

I also say "one" doll  because of a recent Cinderella vs. Belle incident which occured in my niece's room. She had Cinderella, and loved her. Loved her just silly. But then Belle came on the scene  and now Belle is the belle of the ball, and Cinderella has been declared the "sea witch" and "jealous." This is of course mainly because my niece watches too many dvds, but it also goes to point out once there are two dolls involved, it can get ugly. Especially if there's only one prince!