It will be because her prolactin levels are high. Worth getting a check up I think.
Breast milk is white but you get different kinds of milk, like the thinner fore milk, and thicker creamier hind milk. Plus in the beginning it could be like colostrum which is a clear color. Keep in mind she probably does not have a lot in the way of milk producing glands yet anyway, but still able to produce some goodies, like a componant of milk.
Did you know milk is a blood product? Weird.