She's adorable!!! I have no idea about coloring since I've never had a chi puppy but the folks here will have some thoughts on that. I just wonder why you're scared she'll be bigger than her parents??? Nothing wrong with a chi weighing more than 3 pound and she'll have a better chance of being healthy if she is bigger. Lily is 4 pounds and she's a lil tiny peanut.
I feel bad that your pup's mom and dad are the same size... from what I've learned here, the mom should be about twice the size of the dad or there are huge risks in giving birth. I wonder why your breeder allowed that to happen.
Anyway, I wouldn't worry about your baby's size at all. Her personality and health are all that should matter.