Also, her head has not grown since her nine-month check up. She is developing normally as far as I can tell. My doctor has referred her to a pediatrician. Several readers have express concern about the soft spot, so I'll elaborate on your question a bit before I answer you directly.
Some bones meet and fuse before the baby is born.
Others fuse after birth to allow room for the brain's tremendous growth over the first year. More than 50 percent of the total growth of the head occurs in this first year of life. If all the bones fused early, there would be no room for the brain as it grows. The anterior fontanel is the one most parents recognize as the soft spot. It's on top of the head toward the front.