Hello- My Mother Had Subarachnoid Hemmorrhage From Brain Aneurysm Two

Hello- my mother had subarachnoid hemmorrhage from brain aneurysm two weeks ago. They put in lumbar drain and removed it a few days later. After about 6-7 days, she started experiencing severe muscle spasms in tailbone and into leg (sciatica). She said this is the worst pain she had felt and cannot get comfortable. MRI done today and waiting for results. Dr doesn't think had to do with lumbar drain. Have you ever heard of this happening after aneurysm clipping surgery?