The next time you're at you're regular doctor, be sure to let him/her know the receptionist wouldn't let you talk to Betty. She would be in a much better position to help you decide between urgent care, waiting a day, or even being able to squeeze you in with another doctor in the group than the receptionist.
Unless the receptionist has medical training herself she should not be denying you the option of the nurse's opinion.
Sometimes the individual who serves as the "gatekeeper" doesn't realize what the situation actually is!!!
I hope your child is feeling better soon!