She's posted near the Vault 15 as a guard and allows people with a proper sign. After leaving the Squat, one night she was camping and she heard the deathclaws talking. They found her and took her to Gruthar and she lives in Vault 13 since.
Rescue Chrissy: Dalia allows the Chosen One to go by her in his/her search for Chrissy and, fearing reprisal, flees the Squat and dyes her hair black. After leaving the Squat, Dalia wanders the desert until one night, she sees a campfire.