I assume Ankara is an option, but yes she needs to attend the interview.
My Mother was in a wheelchair last time she visited, now she did not need to attend an interview, the biggest issue was Travel Insurance, I think 2 weeks cost the same as her return flight.
Now I have no knowledge of the Turkish Insurance market but you might want to check that out, it will only get worse as she gets older and her medical issues worsen.
I am sort of assuming that if she can get to the Airport she can get to the Consulate.