Jabe was a representative of the Forest of Cheem.
Upon meeting the Ninth Doctor, she took an immediate interest in him. After discovering his true heritage, she felt grief at the loss of an entire species, with him as the only survivor. She captured a metal spider, which revealed Lady Cassandra as being behind sabotage on the platform and the death of the Steward. As a backup plan, Cassandra blew up her other spiders, disabling the platform's safety.
In the air conditioning, Jabe sacrificed her life by holding down the switch that allowed the Doctor to pass through the fans and reactivate the safety. She burnt to death under the immense heat that came through. (TV: The End of the World)
In her brief time with the Doctor, Jabe revealed herself to be kind, gentle, clever, and brave. Of all the partygoers, only Jabe suspected the Doctor's true identity, and when her suspicions were confirmed, she sought to befriend him, expressing grief over his loss and sympathy for his loneliness. She accompanied the Doctor in his quest below decks to manual restore the shields, even though she knew that her wooden body was in danger from the rising heat. In the end, she was willing to sacrifice her life to help the Doctor save the other guests on Platform One. (TV: The End of the World)