maybe the eye, though it wasn't actually said it was alien.

Didn't Jack confirm that it was alien?

Ther's no such thing as being 'too philosophical"!

I agree, there's no proof, and no real evidence, that Gwen is psychic. I maintain it's a possibility and I like it as a working theory. She obviously doesn't know about it, if she is.

If that isn't it, why do you think Jack sees her as an asset to Torchwood? Or is it just that he's charmed by her big eyes and cute smile?