Post-traumatic stress disorder (PTSD) is a mental health condition that's triggered by a terrifying event — either experiencing it or witnessing it. Symptoms may include flashbacks, nightmares, and severe anxiety, as well as uncontrollable thoughts about the event.
In general, PTSD is more commonly associated with severe traumatic events such as war, violent assault, or life-threatening accidents. However, trauma is highly subjective and varies greatly from person to person. What may be a minor event to one person can be a major event to another.
That said, it's theoretically possible, though quite unusual, that a particularly intense and frightening experience on a theme park ride, such as the Tower of Terror, could lead to symptoms similar to those experienced in PTSD, especially in individuals who are predisposed to anxiety or who have a history of other traumas. If your friend's symptoms continue to persist, it is very important that she seek help from a mental health professional.
It's also worth noting that there could be other psychological or psychiatric factors at play here. It may be possible that the ride triggered an underlying anxiety disorder or other mental health issue. Regardless, the symptoms you're describing are serious and should be evaluated by a professional.
However, it's critical not to self-diagnose PTSD or any other mental health condition. If your friend is experiencing these symptoms, it's very important to encourage her to see a mental health professional who can provide a proper diagnosis and treatment options.