"I wouldn't have gone to the trouble of seeking anyone out if I wasn't determined to do something about poor Gwyn's state," said Toria quietly. "I don't suppose Uncle William has been told of the possibilities?"
There was the risk that this could kill Gwyn instead of heal her. Toria didn't think that Elia would have offered her help at all if she was responsible for the poisoning, and she didn't suspect that Jaehaerys was the sort of person who would poison a child. Tymor wasn't close to him, but was on friendly enough terms with him that poisoning a child didn't match with anything Toria had ever heard about him. She wouldn't have put him above poisoning her uncle if he felt it was necessary, but her little cousin? Not as likely. Especially after a bargain had been made, and the poison could be traced back to him by the richest house in the seven kingdoms. For better or for worse, Lannisters paid their debts.
"With so many people having access to the kitchens, there are others who could be blamed in the event of failure, though."
Toria wasn't a cruel person, but if it was a matter of her head rolling or the head of someone who worked in the kitchens...rest assured, it would not be her head on the chopping block. She wasn't as skillful in the game of thrones as her father, but she understood how it was played.