Okay, let’s tackle this. So Heidi has 21 years of experience as an Intervention Specialist. This role is typically considered educational support, which is not as in-demand as tech or finance roles. However, experience in supporting students with special needs is valuable. Location is the US, which is a broad market. Considering her experience, I'll look at average salaries for Intervention Specialists in the US. According to various sources, the average salary for an Intervention Specialist in the US is around $40,000-$60,000 per year. Given her 21 years of experience, she might be able to charge a higher rate. Let’s assume a higher end of the scale, around $45 per hour, considering her dedication and experience.