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I would consider taking your daugher to see a child psychologist for a few sessions. Losing someone close is very painful and confusing to little kids, particularly when they're so young that they don't have all the verbal skills to express their grief. Working with a child psychologist could help your daughter express and process her loss. My guess is that (unless your daughter has also experienced previous significant losses) this work would likely not take more than 3-4 sessions, but the psychologist you work with could probably give you a more accurate estimate after the first meeting.