"I'm not sure. That would depend on your relationship with them." Whether or not something was too personal generally relied on several subtle social cues. He wasn't certain how well Ariadne knew the others that she had been with, their mannerisms, or if it was something she would even feel like asking. 

"If we don't know, that still leaves the possibility that it could be related to that illness." Connor put a hand to his chin. "And whatever you experienced as a result, seems to be triggered by pain." It had to be. It wasn't the plants, she hadn't used any strange ability while talking with him or while she was still experiencing stress, and she emphasized it was when she pricked her finger. The only rational conclusion was that it was pain-related.