Here is a Snopes article about the image.
The images are real, and they do indeed show the same girl. The implication of the meme seems to be that CNN faked the image, or used it in a different context. There is no evidence for either.
Were these photos published or used by CNN?
The first and second image were used by CNN and correctly describe the context of it. I was unable to find usage of the third image, but that doesn't mean that it doesn't exist.
If so, are the photos shown in this meme unaltered from their use by CNN?
They are cropped, but the same girl is indeed in all of the original images.
Were the photos represented by CNN as being from different locations, as the meme implies?
No, not in the uses I could find.
The first image is described as showing the results of a barrel bomb attack in August 2016 in Aleppo, and the second image is described as a man carrying a wounded child in Aleppo in August 2016.
We found no evidence that CNN ever used any of these photographs to represent anything other than that one event.