I think if it began turning gray, she would dye it. Also,m she likely wears colored lenses for that green, because I doubt her ethnicity can have green irises.
I doubt your last statement is correct IV. I don’t know what her ethnicity is, but I think it’s totally possible for her to have green eyes. Try to be open-minded.
I always thought she was from Polynesia or another pacific islandic country.
I always thought that she could be of latin descent. But even still, it is possible for her to have natural green eyes.
Honestly, there are so many nationalities/races that she could be that I give up. 
I don’t know. But it still isn’t likely that she would have an eye color other than brown.
I still believe her eye color is natural.
I think her hair and eyes are natural. But then again, I’m just assuming that, I don’t really look too much into details like that.
Nobody has platinum hair naturally. 
Are you sure? i think I want to disagree with that.
Yeah, and nobody has the power of superspeed or invisiblity naturally. This is an animated film. If Bob can be born with superpowers, when that isn’t plausable in real life, couldn’t a normal woman have platinum blonde hair in this animated film naturuarlly?
I think people are looking way too much into this, it’s an animated film guys.
Yes, I’m sure. What is the point of this argument? Fine, we disagree. You guys win. Whatever. I didn’t want to argue, I was just making a point. But whatever. 
Any other symbolism you guys want to point out?
So were we. Just sharing opinions and ideas.