Queen Ursula was not aware of Avulo's visit to the king yet hence her shock when prince Walter had told her. She did not need anyone to tell her immediately that it would be prince Hedy who had planned what Avulo had spoken of. She promised prince Walter there and then that they would not allow anyone decieve them nor would they fall for any spell.
She also decided that she would make sure whoever is responsible for such would not go Scot free. She was going to make sure of it.
"Just dont worry about a thing my dear son, I and your father have known more than we knew and you will be rest assured that we will not sleep over things like this. We will handle it"