Source: The Great Interpretation of Dreams (Ibn Sirin)
Seeing one's deceased mother in a dream indicates the arrival of mercy and relief. If she is sad, it indicates the dreamer's negligence towards her or in his religion. Her words are true.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Seeing one's deceased mother alive indicates relief from worry and grief and healing for the sick.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Seeing one's deceased mother is interpreted according to her state, and it indicates compassion and mercy.