It doesn't mean anything. The nurse just didn't know how to explain that to you. The only relevant part of the head measurement is if it significantly changes. My son was pretty consistently 90 percent weight, 75 height, 25 percent head. He's now 2, head circumference is still 25 percent (h/w are both 75 now). The pediatrician said it really doesn't matter even a tiny bit. The reason they measure it is to make sure the head grows consistently, and that it doesn't balloon up at some point, signifying something else in there (fluid, tumor, whatever). He assured me that it's not uncommon, will not impact my son's development (which it hasn't, he's exactly on target for milestones, if a little lazy with language, but he's home all day with me, so there's the likely explanation). It makes him look a little older (because babies have larger head to body proportions). His proportions are actually more like those of an older child, and as he gets older, all the other kids will just start looking like him.
As far as the other measurements go, she's just tall and heavy for her age. Maybe she'll be tall when she grows up, maybe she was just having a growth spurt at the time. It really doesn't mean anything until they're at least 2, except if the proportions are significantly different (then they might want you to increase or decrease feedings). They're just charting it to make sure she is growing well.