Although Jessi's been programmed to get close to Kyle, she only has eyes for Declan. When she starts school, Lori befriends Jessi as a way of keeping tabs on her. Nicole, who finds many of the things Jessi says in therapy alarming, is also watching Jessi.
Kyle has his suspicions too, especially when Jessi wanders into his room and fixes a broken radio in moments. Then there's Emily.
Charged by the corporation with using Jessi as a ploy to get at Kyle, she seems to have lost control of her charge. When she finds Jessi at a dance she's been told she can't attend, both go ballistic. And the X on Lori's picture? The threat plays out when Lori is attacked after the dance.