Perhaps she doesn't have any? Maybe she was single (we had 2 ladies at the home I work at who never married, therefore no chidlren/grandchildren). Perhaps she was married but shes' out lived her children (and maybe even grandchildren?). Perhaps her family can't afford it - they're VERY expensive.
I'm currently trying to deal with this issue for one of my clients. She is 97, and totally isolated by her hearing impairment.
She had the appointment in December, but Audiology have said it could be up to 2 years before she gets her aid. She will very likely die before she is given the chance to have a normal conversation again or hear her great-grandchildren's voices. GP agrees it is a f*cking disgrace, but can't do anything to influence matters.