I know harness pathology sets in quickly so does waiting 2 hours (best case) for help mean probable death?
If she is unconscious, she'll be dead in minutes -- about half an hour maximum, but could be much less. If she's just stuck, she could be okay for much longer. At my first hanging rebelay, I was stuck for two hours...
A stuck caver could rapidly deteriorate, so in any case you must be prepared to act. Lowering is almost always the fastest option. If you have enough rope to lower her, do that. If not, it is possible to carry out a midrope pickoff, and the most efficient methods involve cutting the rope so that you do not need to lift her bodyweight. These techniques require plenty of practice, a knife, and courage!
If it is practical to have enough spare rope to perform a simple lower and
not a pickoff, then this is obviously much better.
If you choose to raise her instead, you could use the Spanish Pendulum method, or another counterweight method. The Spanish Pendulum allows you to remain at the top of the pitch, but does not confer a mechanical advantage. Lifting can be made easier by using a different counterweight system where the rope end is passed back through her harness maillon, so that the maillon is used as a "pulley", creating a theoretical 2:1 advantage.
With this latter counterweight method, as with a pickoff, you will need to downclimb to her on your ascenders. Downclimbing is slow, but it is the only safe way to descend a loaded rope. 50 feet is not that far; I think you would manage that with more practice. Nevertheless you are wise to be thinking about your own capabilities when selecting a rescue method.
Unless you have three people to haul, a hauling system will likely be less effective than a counterweight. This is certainly the case if you are alone.
If you are raising her, you will of course need to get her safely off the rope when she reaches the top...