First Warning by Anne McCaffrey

In bestsellers McCaffrey and Scarborough's charming first of a new trilogy, Khorii, the adolescent daughter of Acorna ("the unicorn girl"), has her share of problems while at school on an asteroid that serves as a refuge for war orphans after her parents go off to use their Linyaari healing powers against a deadly plague. Khorii's roommate doesn't like her feline companion; a bully doesn't care for her android foster brother, Elviiz; and she learns about human nudity taboos the hard way.