more from wiki:
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Exposure to very loud noise (90 dB or more, such as jet engines at close range) can cause progressive hearing loss. Exposure to a single event of extremely loud noise (such as explosions) can also cause temporary or permanent hearing loss. A typical source of acoustic trauma is a too-loud music concert.
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just thought I'd look into modern implants and such, artificial ears and things like that:
here
also, the fact that her right ear is still functioning (though we don;t know how well):
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Unilateral hearing loss
People with unilateral hearing loss (single sided deafness/SSD) can hear normally in one ear, but have trouble hearing out of the other ear. Problems with this type of deficit is inability to localize sounds (ie. unable to tell where traffic is coming from) and inability to process out background noise in a noisy environment, such as in a restaurant.
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anyway, with only one ear totally deaf, and with rapid advances in medical technology, don't give up hope...
in the mean time, she'll have to take as much care of her good ear as humanly possible.