"It just --- if I didn't admit it, to anyone, I could pretend it was in my imagination. Hell, Fred helped me out with that. And it turns out it was - George wasn't attacked by a Death Eater, he was just working on a project." Although Angelina was trying to convince Oliver she was fine, her tone was full of anger. She would be upset for a while, and anger was what Angelina's emotions often manifested in. She cared about George, and he had scared her. Just like how Angelina had yelled at Oliver when he came back - she needed to scream at George.
"I didn't want to see anyone," Angelina admitted. She hadn't been herself lately, but she was no longer herself. Ang was a witch without magic - a muggle. A muggle living and flying amidst magic.