He means she's imagining it. That it's not really happening aka it's just in her head.
Lin Zichen laughed, "Stop finding trouble for yourself. It's not so easy to develop calluses. I think it's mostly in your head."
Urban · Bamboo City's Little Overlord
I thought someone had to be at the advanced level before they could go to the Origin Land.
"I heard that the younger generation from the military region has all trained in the Origin Land. I'm not sure how strong they actually are."
Evolving infinitely from ground zero
Urban · Bamboo City's Little Overlord