I think she did this because people have called her "fake" for wearing the long extensions...I think people assumed that because she's biracial and she chooses to wear extensions, she's somehow trying to distance herself from her natural kinky/nappy hair. I think she believed that sort of public perspective made her somehow less believable. So she switched it up, ditched the extensions.
And, to those of you who may say she's as free-spirited as her Mom and Dad and she wouldn't remove extensions because of any public opinion...not true. She very much is impressionable and easily influenced. If you go back...google candids of Nicole Richie over the last few years, you'll find that Zoe is dressed identically...lame pink Baby Phat phone included.
The weave's gone, at least for now, and I hope she finds her own style.