Haha there is hardly a horse scene, never mind a dressage scene. There are two barns that come to mind that have dressage rings. The first is an arabian breeding farm called Whitehaven Plantation that also has a dressage program. It is located in Bishopville SC. The second is Tally Ho Equestrian Center, located in Timmonsville SC. It is mainly a H/J barn but the trainer has a few dressage students. She also allows outside trainers to come and teach for the more advanced riders. Camden is much more 'horsey' and not to far from Hartsville if these places don't fit the bill.
Now if she needs a rider for these nice warmbloods, THAT I can help with .