What Causes Numbness In Little And Ring Fingers?
She is correct.
Detailed Answer:
I read your question carefully and I understand your concern.
That description is compatible with damage of the ulnar nerve. Most commonly the site of the damage is at the elbow where the nerve us well exposed near the surface with hard bone underneath.
However the neurologist is right, that doesn't mean they should operate blindly at the elbow, if the site of compression is further distally that type of intervention won't solve the problem. If history of trauma and nerve conduction studies indicate the site to be in the forearm any intervention should address that site. After such a long time though there is the chance for some symptoms to remain due to the nerve sustaining permanent damage.
As for the best place to get an opinion, it is true that the XXXXXXX Clinic has a world wide reputation, known even to someone practicing in Europe like me, so would agree again with your neurologist in saying you'll get the best expertise there.
I remain at your disposal for further questions.