Hi A.! Well I will give you advice from a pre-school teachers perspective and I too am a mom.
I would make sure your house and her room is flooded with your culture and other cultures. Books especially, also pictures, dolls, furniture, toys, family photos, videos. Anything you can think of and make diversity a regular part of your conversations. Dinner time and talking about foods are great. Make games with all your children who can point out the most differences and similarities in eachother.
The point is to make her feel confident in diversity and give her a healthy respect for all cultures. Make her an educator in an environment where most kids 'don't know' and make her feel special that she can help other people understand differences. This is an ongoing project for the next several years.
She is already eight and I wouldn't be surprised that she has had her feelings hurt. So for example, pick up a book on Native Americans and talk about how it was a mistake that they were labled Indians. Ask her how that might of made them feel or feel even today. This kind of conversation will open up the door for her to express her own hurt feelings and maybe you have your own stories to share.
Lastly, I would never bring up ridding her of her hair. Let her initiate that and if she does she probably got that idea from either a peer or media, so I would make that into another piece of conversation.
There are also many famous people she may already know about due to her age that she has learned who have 'differences' and have made a significant impact in the world in spite of what people thought of them. Talk to her teachers to attain resources for yourself and visit the library too. Goodluck! Feel free to respond with any questions or concerns due to my response.
Blessings,
V.