Is there a specific interpretation for what the grandmother saw in her dream concerning her deceased daughter-in-law, who was weeping and saying, "How fortunate you are, able to pray and supplicate," and when the grandmother invited her to come along, she refused, saying, "I cannot, I have a guard who will not let me go with you"?

The deceased benefits from people's prayers for them, charity given on their behalf, seeking forgiveness for them, and all acts of obedience. Therefore, there is no harm in praying for mercy and forgiveness for the girl, giving charity on her behalf, and dedicating the reward of that to her. This is a legitimate matter for every deceased person. Rulings are not based on dreams.