The color and headstamp look right for an older champagne. That stripe could be caused by a number of things. I'm leaning more towards something in YB complex vs GS because of the color saturation being more even on the sides instead of much heavier at the top, as well as the fact GS are much harder to make and not as common. Just a single copy of Specter could achieve a stripe that nice. No way to know for sure without breeding, especially with Champagne in the mix, as they are so variable.
From the pic she does not look underweight, but I agree she does look dehydrated.