Source: The Great Interpretation of Dreams (Ibn Sirin)
Seeing one's deceased husband in a dream indicates the woman's family scattering and her poverty if he is sad, or goodness reaching her if he is happy.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Seeing one's deceased husband alive indicates the righteousness of her condition or her marriage if she is eligible.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Seeing one's deceased husband is interpreted according to his state, and seeing him in a good state is good for the woman.