There is no "normal" amount of pubic hair. It depends on when you start puberty. An 11-year-old girl, for example, isn't going to have the same amount of hair as a 15-year-old.
When puberty starts, most girls will usually begin to get breasts and then pubic hair will start to grow. Sometimes it can happen at the same time. The hair usually gets thicker and she'll get more of it the farther along she is in puberty.