Who is The Hive Queen from Children of the Mind and what is their importance?

The Hive Queen has grown very close to both humans and pequeninos. Resembling a large insect, the Hive Queen is actually more mammalian in nature than she appears. She is extremely indebted to Ender who not only saves her from annihilation at the hands of Earth's Fleet but also carries her for many years until he finds an ideal place for her to reestablish the bugger species, Lusitania.