Her skin color changes depending on emotion.

From left to right and top to bottom:

1. Normal/Original
2. Blue = Sadness Emotions
3. Yellow = Happiness Emotions
4. Red = Angry Emotions
5. Pink = Lustful/Romantic Emotions
6. Green = Disgusted Emotions
7. Purple = Fearful Emotions
8. Orange = Relaxed Emotions
9. Gray = Sick/Dying (This one is not based on emotions, this one is a state of being.)