I personally don't like that breastfeeding I.Q. assertion. I think it puts a lot of guilt/undue pressure onto moms. With that being said, I could't breastfeed DD8 for a variety of reasons, but was so happy I had the chance to breastfeed DD5.
DD8, the formula baby has FSIQ 148 and higher than breast fed daughter.
Your daughter is very, very smart.
I only use their numbers as a prompt to investigate what they need for appropriate learning/educational experience.
DD5 "shouldn't" be able to do the math she is doing now, yet she is........just do what you need to concerning providing appropriate education for you child.

peace,
Neato