From someone who is often too literal-minded, two possible explanations come to mind:
1 - She actually did have the tattoo removed, or it was temporary.
2 - One of the pictures could be horizontally flipped to make them both face the same way, thus the tattoo is still there, but on her left side rather than her right side.
The color sequence on the pattern of the pants is inverted too, which could also either mean different people or a flipped picture.
