Things I always try to remember with veterinary investigations, whether they are referrals or regular vets, is a) the animal doesn't know its sick - they simple deal with the way they feel at the time. b) they don't know that they can get better or worse - they don't have a concept of chronicity or deterioration c) giving a problem a name doesn't actually change anything for the animal.
I don't know Ginger's full history, but if she is chronically very ill and most conventional treatments haven't worked, chances are they won't find something novel that will cure her. But as others have said, she can probably be made more comfortable, either by pain relief if needed and/or making her more able to comfortably function and express normal behaviours. Others disagree, but I always thinks its better for animals to have a shorter, more comfortable life then go suddenly than battle on for a long time in a gradually deteriorating state. Animals don't know how long they are supposed to live, they don't have regrets or mourn for the life they could have had. Only we do that, so if she's comfortable and able to act fairly normally that's the best you can hope for, even if its not for very long.