I agree with this wholeheartedly. I would get her to speak to a mental health professional - maybe start with your family doctor. They will be able to assess whether she is suffering from some bigger anxiety issues or whether it’s just a case of not being ready and be able to teach her some coping strategies and tools to manage her anxiety.
I’ve suffered from anxiety for a really long time but haven’t started dealing with it until recently when some other health issues forced me to. One of the big things for me has been learning to drive; I’m a bit ashamed to admit that at 28 I have never sat behind the wheel of a car. However, after working with a psychologist for a month (focusing on anxiety in relation to my health issues and just anxiety in general - I didn’t even mention driving until my last session), I feel like I’m ready to tackle it.
Anxiety can really mess up one's life. I developed it about 5 years ago at the age of 35. I have been driving for 25 years and never had an accident, no tickets, and consider myself to be an excellent driver. However, when my anxiety is bad, I get scared to drive. I'm "convinced" that every time I get in the car without my kids, I am going to be in a terrible car crash and die, leaving them without a mother. They both have autism and my greatest fear, and all my anxieties revolve around something happening to me. On bad days, if I have to drive somewhere, it is awful and I lose all my confidence. I haven't sought therapy yet, but feel like it's time. My son has an excellent therapist and she has offered to be mine as well.