A young girl of the telepathic Cairn, daughter of Maques, whose presence aboard the Enterprise-D in 2370 unlocks Lwaxana Troi's buried grief for her drowned first daughter.
Hedril appears in the seventh-season episode Dark Page. She is the quickest of the Cairn delegation at learning spoken language and is Lwaxana's favourite pupil. Lwaxana is exhausted by the work of teaching telepaths to talk, but it is Hedril who affects her most.
The girl looks very like Kestra, the daughter Lwaxana lost decades earlier and has never spoken of. When Hedril falls into a pond in the arboretum, the accident echoes Kestra's death by drowning, and Lwaxana's mind closes in on itself.
Inside her mother's mind Deanna Troi keeps meeting a figure of Hedril, who turns out to stand for Kestra. Hedril was played by Kirsten Dunst, then eleven, early in her screen career.