Cynthia,
I'm assuming this is for the Arts Center. I took a look and looks like the secure area is still on the
theartscenter.net domain. That means you ~can~ track it. Thats the good news. The bad news is the secure pages dont have the Google Analytics tracking script so it is not tracking. Thats the bad news.
Easiest solution I can think of. Move the "thank you" page off the secure area and into the Wordpress site. Its a thank you page and doesn't need to pass any private info. Then the tracking script which is set up on Wordpress will apply and work. Google Analytics will be blind to the activity on the secure pages, but at least you can track goal conversions.
The alternative is to get the tracking script onto the hosted secure area. Im guessing that may not be easy.
Feel free to send me an email if you have more questions. We have been sharpening up on tracking conversions and data collection lately.