Fair game for anything for Amelia; she's totally a normal human. She's not terribly deceitful or skilled at hiding her emotions anyway, so her emotions and thoughts would be pretty close to what she's saying. Slayers canon seems to imply telepaths are rare to nonexistent*, so she's unlikely to have much of a defense. That being said, she's pretty strong willed and knows about physical illusions at least, so if she suspects foul play, she'll at least try to resist. (OTOH, she's also easily misled, so...)

* The novels mention that a few sorcerers have the inborn gift, but it's not something you can develop.