What can possibly treat numbness in neuropathy?

My sister has had diabetes many years and because its been so high so long she's developed neuropathy in her feet. She wants to die most nights. It's simply HORRIBLE, this condition. The nerves are dying so most of both feet are numb, and she can barely walk. It's just a punch in my gut seeing my best friend like this. 😟She can never come out with me anymore. It's killing me inside.
We've read there's not much treatment for the numbness symptoms. And that's the worst aspect she said, and that It's a sickening feel. She barely even ate high carbs, but Bec her body was so insulin sensitive, she could never take the amount her body NEEDED. So it would just stay higher, rather than chance it constantly dropping rapidly and dangerously.
Any ideas on anything that might help numbness??