Sorry: more questions.
What stations does she want to listen to? Are those staions available on DAB in her house?
A friend of mine bought his mother a DAB radio for Christmas. She looked at it and asked how to get MW. It turned out that she wanted to listen to a local BBC station which wasn't ( still isn't ) on DAB and of which even the FM reception is poor in that area. He kept the DAB radio for himself and bought his mum a new MW/FM radio.