I'm estimating Sonja's hourly rate to be very low, likely in the range of $25/hour, considering her role as a Lead Teacher and location in Surprise, Arizona. This is a very general estimate and may not reflect her actual market rate. Lead Teachers with similar experience in the US typically earn around $40,000-$60,000 per year, which translates to around $19-$29/hour. However, this rate is highly dependent on the specific school, location, and industry demand. Without more information, it's difficult to provide a more accurate estimate.