Exactly, your wife unfortunately can’t board a coach. Therefore going that bit further down the fjord to the village of Geiranger is not adding that much to the splendour of travelling down the Geiranger fjord, you will have already covered the majority of it especially if after Hellesylt they go past the Seven Sisters before travelling back. I know it is a compromise but look at the map, it is worth thinking about. Hellesylt would be easy to exit the ship with a wheelchair and view the village and fjord.