I assume you have considered bluetooth headphones? This would allow her to adjust volume just for her. My partner uses headphones in our bedroom as she stays awake all night.
I use a Sony SBS-XB13 for TV and music. It's small and I can put it right next to my ear or close to my good side. It can be plugged in or run all day on battery power. Only problem would be the sound delay, the Sony is fine but others are too delayed to watch TV with.
The best new hearing aids, in addition to being customizable to one's personal hearing profile, also include bluetooth connectivity... The Phonak Audeo Paradise also has a specific TV broadcast device that further enhances direct to the aid.
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