Advice needed (traveler with mobility challenges?)

We are doing a surprise trip for my mom. She is in her mid 70th and having mobility problems. She can walk but not long and stairs she can do but not many and slowly.

We land and departure from Naples. We want to visit amalfi coast but without a rush. What's better to do a lot better day trip or stay on the Amalfi coast (where?) and explore the area slowly using public transport, reducing the walking to minimum. If that's at all a possibility.

Please advise!