The way that Jiang Yuwen phrased her question made it clear that she couldn't believe that Yun Xi would actually get an invitation with the stamp of the Jiang family's head.
Her arrogance made it seem like Yun Xi was nothing more than a thief or a liar in her eyes.
The crowd who had their opinion shifted not long ago by Su Ximan changed their minds once again now that someone from the Jiang family had spoken up. Everyone now turned their attention to Yun Xi. They were all curious as to how the lady, whom they and Jiang Yuwen had never heard of, managed to get her hands on the invitation, which was stamped by the head of the Jiang family himself.
They wanted to see how Yun Xi, who had kept her mouth shut the whole time, would try to explain herself.
With how the situation had turned out, Yun Xi's plan of keeping a low profile was completely ruined. She knew she had no choice but to stand in the spotlight to clear her name.