barkin on the trail

I hunted her on the same place for 3 years. South Florida, pines and big palmettos, no difference in vegitation between summer and winter. I usually put her down alone, really didn't matter if other dogs were down with her, really independent, almost seemed like she would try and go away from other dogs to find one on her own. Hunted at a dead run most of the time when you walked her, when you roaded her she stayed about a hundred yards in front of the truck. Had pretty good bottom to her, would run one for 3-4 hours. She is about 5 now, she shouldn't be slowing down yet?