you cannot overfeed a breastfed baby, as breast milk is rich in the beginning and then gets more watery. Basically nature has it spot on, and you should not worry!
my DS2 was very large and "greedy", much bigger than the other kids. I did not want him weighed in year R when they do the weigh-in thing, as I did not want to get patronising letters from the NHS.
He was never overweight, just always the biggest baby, biggest toddler. He still is the tallest in his class, still eats like a horse, and is now almost skinny (age 7) after having been such a lovely round tot.
He is just built a certain way, with wide shoulders, big feet, he'll be a tall guy. No wonder as I'm 6 ft1 myself! (I was a FAT baby too!)
can't tell you the amounts of comments I've had about his size, he is taller and heavier than his older brother.
Your DD will be fine, and will probably just be a very tall adult later on!
I did space out the feed a bit more at that age though, and started feeding him solids much earlier than my other DC.
trust your instincts.