She keeps up with Hellion as well so she's used to rebellious, dismissive teenagers. Why not add another brooding boy to her list?
Her powers tap into the place in time and space where dark matter originates so she'd probably have to explain to him just how bad of an idea it is to try to copy her. She may have phenomenal cosmic powers, but the price she has to pay to use them is the slow shredding of her own humanity. Without her husband, she'd be a feral shadow-monster who killed people to survive. She would probably have to make that pretty clear if she caught him trying to replicate her abilities. If he tapped into the darkforce dimension, it could be very, very bad.