The Mystery of Trixie Lulamoon

This is the mystery of an Equestria Girls Rainbow Rocks doll I got. Here it is:

What's the mystery? The mystery is that the stock photos for this doll on most sites aren't even for this doll. For example:

Her hair color is different and the colors of her dress are different(as well as a variation in the style of the bodice). And yes, this picture is for the same doll you see above!

I found another variation, too:

The skirt of the dress on this doll looks practically the same as the other stock photo, but the bodice is like the original doll. Also, this doll has the Rainbow Rocks streaks in her hair, unlike the other two. Her guitar appears to be clear and her hat has yellow. 

The variations could perhaps be country-exclusive or prototypes. If you know anything about these mysterious variations, please let me know!