It was time to put a stop to that nonsense before her brother actually paid attention to what was being said. Hera didn't think it would be an issue. Hades rarely dealt with the living. But rarely was not never and there was always a chance this would put a crimp in his day. She didn't want to listen to him complain if it did. So with an expenditure of will, Hera manifested into a corporeal form that came into being in a temple that smelled of burnt cow and death.
Just in time to see her baby brother about to ruin her day, not to mention the months of hard work that had led up to it. She would not undermine Hades in front of a mortal, especially not in his own temple, so she did not move to stop him. She did, however, clear her throat audibly. Then she waited, one brow arched in mild irritation, for him to look her way.