Your niece is in the special category
The neurosurgeons must be tearing their hair
My brother in law had this after falling off his motor bike. 90% stop spontaneously which his did - you wait and his nose stopped dripping.
The others - off th etop of my pretty little head, you identify the site of the leak and then patch it with dura
Since they wait around for yonks before doing this, I am not surprised the results are - - - patchy
ans no 6 - come on down - is about epidural which is not the origin of the leak I imagine... ( or is)