Thank you for your question.
The signs are related to compression of nerves in the lower spine as you have rightly said. Different medications like pregabalin
can help with this nerve type of pain. Also epidural injections can be done for pain relief if allowed by the anatomy of the spine. As she has already had three surgeries this may be challenging. It is recommended to see a pain specialist to discuss the feasibility of all these options.
Wish her the best recovery.