Is Marlena’s reaction fitting?

Since Kristen first turned up in Salem, the usually confident Marlena has turned into a woman on the edge. She’s of course right in her assumptions that Kristen hasn’t changed and that the DiMera has an agenda but she’s seen as paranoid. Soaps.com’s wondering if you feel she’s being over the top, or if she has reason to act the way she has been over what Kristen’s up to!