I have had many spinal problems, but never fluid leakage. Has your sister been to a Neurologist or an Orthro Dr? She sure needs one, both are skilled to deal with this. My ortho took my Stimulator out a couple weeks ago. He didn't put it in, but while he was operating on me I ask if he would remove it.
He said if it would cause spinal fluid leakage, he would not do it, but it didn't.
It must cause problems when it does.

I would encourage your sister to go to Mayo Clinic. After a person has been sick awhile and (6 months is a long time) they could give up without some prompting from you. Stand by her and give her support and see if you can get her in.
Blessings,
Fancylady