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The 'Wooden Queen' was a being created from an Androzani tree to ensure the safety of its forest.
When Madge Arwell was used as a lifeboat to save the trees' life force and travelled through the Time Vortex back to 1941, the Wooden Queen and King were turned into ordinary wood.
The Queen, like the King was mute. However, it was able to communicate by touching a person's neck and using that person's vocal chords. It presumably grew from what looked like a Christmas tree bauble, from which the Wooden King hatched like a bird from an egg.