This is the 3rd book in the Merlin Mystical Series. Grief and Loss.
 
If you need to support discussing grief and loss with children, then this Irish Fairytale might be a lovely way to do just that. 
 
When Saoirse loses her dearest friend, her world falls silent beneath the trees of Merlin Woods. Guided by the wisdom of the woodland guardians, she learns that love never truly disappears — it simply changes form.
 
Through memory, song, and friendship, Saoirse discovers that healing begins when the heart remembers with love instead of pain.