Heck, if she gets an earmold, I can give her my old Oticon Chili. I bet there are other avenues to procure a cheap one.
I also know my Mom and how to her $10 is like $100 so hearing aids even $1,000 to her would seem astronomical in price. She'd retort, "I'm fine without them".
It's been a decades long battle someday she may give in.
I had a Bose Hearphone, but it broke. It worked quite well - I think about as well as the high priced aids. Sadly, Bose discontinued it (why??) and I can't replace it. With four mics, it was able to cancel sounds from behind you. You only really heard the person you were facing.
[0] https://www.mdhearingaid.com/en/product/mdhearingaid-hearing...
Edit: I notice their dual-microphone Volts are selling for $300 a pair, also. I haven't tried them - but dual mic is what you need in noisy environments. Might be a really good deal.
My mother has poor hearing and she refuses to get a hearing aid mainly due to cost. They are ~$4K per ear she doesn't have the money but to her an elderly person she imagines it as $40K/ear. I also fear dementia has already begun for her. For me I have tinnitus so this drug would also be welcome.
Another interesting drug is Vuity for nearsightedness. Between hearing and sight it will be amazing if such drugs work and were available before my mother or I or anyone dies of old age.