Isabelle Tate

"9-1-1: Nashville" is remembering to one of its rising stars -- Isabelle Tate -- after the actress' untimely death at just 23-year-old. At the end of Thursday's episode, an "In Loving Memory" title card appeared ... showing the late actress smiling warmly in a red outfit. Isabelle passed away on…

11:32 AM PT -- We spoke to Isabelle Tate's agent, who tells us Tate passed away peacefully in her sleep. We're told Isabelle suffered from Charcot-Marie-Tooth, a rare progressive neuromuscular disease which confined her to a wheelchair. Her agent says the disease affects the legs but can also…