Can the deceased be transferred from one grave to another as the wife cannot travel a long distance to visit frequently and she wishes to visit the grave every Thursday?
Salam
Ruling 630. Exhuming the grave of a believer – i.e. opening his grave – is unlawful, even if the grave belongs to a child or to an insane person. However, there is no problem if the body has completely decomposed and has become dust.
So the reason mentioned in the question is not a necessity to justify the exhumation
To know more about the exhumation and its exceptions visit:
https://www.sistani.org/english/book/48/2189/