قراءة لمدة 1 دقيقة I am asking on behalf of a relative, a lady of 58 years old; her husband died 10 years ago, in Baghd

Praise be to Allah, the Lord of the Worlds; and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
Digging a dead body out of its grave is not permitted, save for dire necessity or a considerable benefit, such as to relocate a corpse of a Muslim that was buried among the graves of non-Muslims, etc.
The situation mentioned in your question is not a valid reason to exhume the grave.
It causes humiliation to the corpse, may cause his bones to break or his body might disintegrate, so even shifting it is not possible, etc.
The location of a grave is not important.
One should make Dua' for him and make charities on his behalf.
No doubt these acts are more useful and suitable then shifting his corpse without any valid reason in Shariah.
Allah knows best.