For a moment she looks contrite at his violent reaction, sorry that she had to upset him so. But it's quickly overtaken by her surprise and worry at the state of his mind. She remains seated in the sand to give him (the illusion of) space, but fixes him with an intent look.

"I am me, Ianto. You know this is a shared dream." She's trying to sound calm and reasonable, even though what she saw wasn't reassuring in the least and it probably shows. "I am sorry I startled you, but I thought I could see what happened to you..." Here she struggles, as she always does when trying to put telepathic matters into words. "Something is very wrong. You are... disconnected. Incomplete. Parts of you are dormant, or... not there." She stops, too anxious to be frustrated. Whatever is wrong with Ianto is much harder to diagnose than Topher's problem when he was stuck in the telepathic current; his mind had been all twisted up, but at least it was still obviously healthy.