What Do Lightheadedness, Dizziness, Tinnitus And Cold Extremities Indicate?

Question: I am doing research for my granddaughter who is 17 years old. She had tics as an infant, and was put on a monitor, but didn't have any during that period. Seem to fade away. 5th grade had some that were thought to be brought on by aniexty. She has been a runner in school since 6th grade and last year she started passing out after her runs. She has seen numerous doctors plus a pediatric cardiologist, who at this time was leaning to pots because those were actually her symptoms. In the last 2 months however, her symptoms have been different. She felt faint at school and before they got her to the office, she fell face down on the floor with no attempt to protect herself. Last week she was driving and heard ringing in her ears, pull over and phoned her mother, who had someone get to her until she could get there. They pulled in someone's yard and when she got out of the car passed out cold. She came to about 4 times but passing out again and staying out longer than normal. Her blood pressure was good (last 2 times before it would drop.) It was about 126/86, her hands and feet started curling and she was freezing, and eyes were twitching.
Once the ambulance arrived her mother said and IV and oxygen would generally pull her out. They did both and upon arrival at the hospital, she came to and recognized the nurse by name. However, prior to that she has about 3 hours memory lost. Her cardiologist said this is not symptoms of pot and they have scheduled her with a neurologist. What should be questions they have prepared to ask him?