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Amazon:
Nightmare Kingdom: A Romance of the Far Future by Barbara Bartholomew (
ISFDB), 2nd in The Chosen of Sanctuary YA sci-fi abductee colonization adventures with romantic elements. Bartholomew has had several YA science fiction novels paperbacked from Signet during the 80s (some of which we've previously gotten free in the past), and has also been a Silhouette romance author.
The captive children from Earth have grown up, but Jamie Lewis Ward still is haunted by his memories of the lovely and defiant girl who was his first love. Now the alien emperor she married, Mathiah the tenth, has died of the genetic illness that almost invariably accompanies the extraordinary speaking gift of the aristos who command the many planets of the Aremian Empire.
With his death, the protection that has allowed the Earther captives in New London on the planet called Blood to live in peace and contentment is at an end and the girl from Chicago who married the emperor is widowed and powerless to protect their two daughters. Jamie and Claire who found their own Romeo-Juliet romance ended by interplanetary politics must once again rely on each other as they fight for the safety of the chosen survivors from Earth and deal with the whole new problem of the princess who has inherited frightening gifts through her mixed parentage.