At least 3 more days in the hospital ...

UPDATE (Monday evening):

The doctors came in early this morning and saw a small amount of fluid leaking out of Rachel's incision.  Later in the morning, as the neurosurgeon started pressing around the incision site, quite a bit of additional fluid came out.

Although the fluid was clear, they were concerned about a possible infection.  So, they ordered a CT scan of her head and spine and decided to keep her NPO (no food or water) in case they needed to do emergency surgery.  Getting a CT scan of her head was a major ordeal for her.  It took two separate trips to the scanner.  During the first attempt, she would not stay still enough, even though she was highly medicated.  So, they had to try again later using conscious sedation, and that worked.

The results of the CT scan showed no obvious signs of infection and thus no need for emergency surgery.  Once she was able to have food and drink again, she was mostly calm and peaceful.  She finally fell asleep around 18:30 (after being up since 5:30).

They have tentatively scheduled her for surgery for Wednesday, in the event that the incision does not stop leaking before then.  They are hoping to stop the external leaking by physical means (they added a couple additional sutures and have applied a pressure bandage and are "requiring" that she stay horizontal as much as possible) so that natural healing can take place on the inside.  If her body isn't able to shut down the leak on its own, they will reopen the wound to try to find the exact location of the problem to attempt to fix it.

Apparently, the brain and spinal cord rely on a fairly complex fluid flow system involving the production of cerebral spinal fluid in the brain, transport of the fluid through ventricles in the brain and along the spinal cord, and absorption of the fluid into the surrounding tissues -- with the body regulating those three subsystems to keep them all in balance.

The neurosurgeon said that she might be experiencing excess fluid pressure as her body attempts to adjust to the changes associated with the dethering.  If the leak does not stop on its own and if it cannot be stopped by reopening the incision, she might need a temporary shunt (in the back of her head) to reduce the fluid pressure, to stop the fluid from wanting to escape through the incision, to allow the incision to properly heal.  If they have to go that route, there is also a risk that the shunt might need to be permanent.