In the end, Yvonne never bothered replying to Noah's messages. She could tell that he was just looking for excuses to meet up with her. Anything that could spark a scandal tended to happen in private meetings, not to mention that Noah was still seeing Katie. If Yvonne were to get involved with him even for a second, she would definitely get dragged through the mud.
Once Yvonne was done discussing the details of the foundation with Regina and the others, she returned to Miller Villa on her own.