Sounds like she had either very low end hearing aids or they were poorly tuned. High end hearing aids don't just do band tuned amplification, they also filter

Sounds like she had either very low end hearing aids or they were poorly tuned. High end hearing aids don't just do band tuned amplification, they also filter out repeating noises like a fridge hum, and the left & right share microphone data with very low latency to isolate voices in noisy environments.