Don't know if anyone else can see this, but doesn't her left eye also look different? (Sort of purple?) If the girl on the far right is also Lysithea, then this could be her in the academy phase and something happens to her to change her hair and eye colour, beginning from the left. In the war phase (If we assume that is her) most of her hair is purple along with her eyes. If this correct, then what happens to her at the academy?