How can she save her deceased grandfather from the sin of consuming other people’s wealth?

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Check below answers in case you are looking for other related questions:
Virtue and times of regular Sunnah prayers (Sunnah mu’akkadah)
Saying du’aa’ during prayer asking to marry a certain man

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Related Answers:
Reciting Qur'aan and Sayyid al-Istighfaar in Sujood
Du’aa’ in the final Tashahhud
Raising the hands in prayer
Virtue and times of regular Sunnah prayers (Sunnah mu’akkadah)
Saying du’aa’ during prayer asking to marry a certain man

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