Hi kpc_23,

You seem to be assuming that the problem is a disc herniation. But you only have a narrowed disc space at L2-3 to go off which BTW doesn't correspond to your patient's reported area of pain.

Some interesting findings on her examination though:
1. Lying in bed supine or prone gives sharp pain - doesn't sound like disc to me, more like a joint or something?
2. LF right gives left leg pain - that is a stretch pattern of pain and is consistent with left sided disc problem but can also be stretching of the joint capsule etc.
3. extension exercises gives pain but does standing in extension provoke the symptoms?
4. flexion seems ok. What about F + LF left and right in standing?
5. What about other joints? Wikipedia reference-linkSIJ? Hip?

Just some thoughts. Let us know...