Even if he'd never said, she had made a guess. Being the lord of death wasn't exactly conducive to bringing forth life. But everything required sacrifices, and if no children meant that she was spared a marriage like her sibling's (at least, if you believed the gossip), well, then...that was something she would have to accept.
"Maybe once I feel up to dealing with Zeus," she said dryly. "Still. I'll go soon and pass along congratulations."