Final answer:
Breast development would be the first change that the nurse would expect to occur in a 13-year-old girl.
Step-by-step explanation:
The nurse would expect breast development to occur first in a 13-year-old girl. According to the provided information, typically, the first change that is visible in females during puberty is the development of breast tissue. This is followed by the growth of axillary and pubic hair. Menstruation, which is the start of the menstrual cycle, would occur after breast development and the growth of pubic and axillary hair.