My dd had this experience when she first tried to learn 4 years ago. The instructor taught the basic skills, but had no strategies to deal with her severe nerves. He wore her confidence down to zero, she thought she was hopeless and would never drive.
She gave and went away to university. While she was away my two other teens learned with a different instructor. This one came by high recommendation from another instructor who was too busy to take my twins on.
The instructor we had was fantastic. A much higher level of teaching in every respect - really taught them to be safe drivers, gave them confidence and real driving knowledge and ability. She was a world apart from the previous guy, they passed with no problems.
When my older dd came home, we booked her in with the new instructor, talked over her previous anxieties, what she struggled with etc.
She didn’t need to switch to an automatic, you can learn to drive a manual, the difference was teaching style, her new instructor had a real understanding of teaching someone with severe nerves and clear strategies to help dd overcome this. It was key. She was also direct and clear, but endlessly patient and encouraging.
After 3 previous fails Dd passed on her first test with the new instructor after 3 months of lessons, average 2 hours a week. Not even a minor fault.
If you go on the GOV.uk website you can search for higher level instructors in the professional development scheme. They also have to pass a standards check test every so often and you can ask them what their most recent score was. E.g.,
0-30 Fail Your performance is unsatisfactory
31-42 Grade B You’ll stay on the approved driving instructors (ADI) register
43-51 Grade A You have shown a high standard of instruction and you’ll stay on the ADI register
Sorry for the long reply, but the difference a great instructor made to my dd was immense, she could’ve written your post so I want to share her experience. Please find a new instructor, explain fully and ask them specifically about teaching a person with severe nerves and confidence issues.
Just to add, she usually did only 2 hours at a time because she could become overwhelmed with more, but you do need more than 1.5, perhaps 2 hours twice weekly? Also, that practising in a different car with e.g., a parent, actually proved confusing and unhelpful in my dd’s experience so wasn’t recommended by our instructor.