She was born in 2349 on Daled IV. Her father was of one of the warring factions of the planet, and her mother was of the other. Hoping that Salia's not being from either side would one day allow her to neutrally govern and unify the planet, they contacted the Federation and asked for a Starfleet ship to transport her to Klavdia III, where she would train for sixteen years before her return. Her parents died shortly thereafter.
In 2365 her time had come to commence her leadership and she was transported to Daled IV by the USS Enterprise-D along with her caretaker and guardian Anya. During the transport, Salia became romantically involved with Wesley Crusher, much to the dismay of Anya, also an allasomorph. When Anya found them together she transformed into a large creature and threatened Wesley, whereupon Salia transformed into a similar creature to protect him. Wesley adopted a pragmatic attitude in response and felt they both had to stick with their own respective people, much to Salia's dismay.
Upon arriving at Daled IV, Salia was slightly reluctant to govern her people, having been isolated for so long and unable to explore other planets, but eventually decided to take her place in their government. (TNG: "The Dauphin")