Okay, let’s tackle this. So Diane Pienaar has 46 years of experience as an interior designer, which is extremely extensive. Location is Bloemfontein, South Africa, which might affect the rate. However, her skills in Photoshop, Autocad, and Architectural Design are in demand. Considering her level of experience and skills, I’ll estimate a rate around $75 per hour, which is a rough estimate for a skilled interior designer in South Africa. This rate is lower than what I would expect for a designer with similar experience in the US or Europe, but it's a rough estimate based on the provided information.