I'm thinking we'll find out she is being drugged because she is too chatty -- or something along those lines.
That's kind of what I was thinking. She's just not quite 'suave' enough for the policital photo ops, and the stress of having to measure up and comply with such a spineless fool would make anyone act a little nutty and need tranquilizers... then it's fairly simple to give her something a little stronger every time.