On another thread, JessM said that a woman could never have enough vases or enough parsley. So a vase full of parsley should hit the spot perfectly, bet it will be a first for your Mother .
Seriously, finding gifts for anyone elderly (I include myself in that) is a problem, we either don't need it, or already have it. At my time of life if there is something I want and can afford, I get it, while I still can. Personally I would prefer a really good bottle of wine or port, I know my kids put a lot of effort into finding me a different vintage port each year, that I would not normally buy because I'm too tight, beautifully presented flowers must make any lady feel good. One of our friends children found some old photos of there dad during his motor cycle racing days (he was a TT rider). They had them made into a calendar, it was great. It was a company they found on the internet, guess a search will find similar companies.