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Go on keeping your mother company and talking to her because even if you're not seeing a reaction (because she just can't produce one) she is still in there, and your being there will comfort her. You don't have to keep it up round the clock or anything, or talk for the sake of it, but stick to your normal routine.
I hope the hospice team will be able to give you sympathetic advice and explain what's going on.
It is not unusual for a patient to rally to a point where everyone thinks that patient will make a good recovery. That sounds like what happened with your Mom.
As for telling Mom that her time is limited, I really think in her heart she already knows. I never told either of my parents. Why make their last days/months emotionally painful.
Too often we struggle with what to say and how to say it! A good part of the time, our seniors just want to know that they will be taken care of. Keep it simple, Let her know you love her.