Riza noticed Loki's uneasiness. How he wanted to be accepted. To be loved and be befriended. Knowing that her family would be unsure of him and possibly hate him. She wanted to help him be forgiven and try to help him find where he belongs in the universe. This was a first for her but after learning from her family and everyone who has been around her, she would do what it took. Even if it meant going against her family. 

Through the window if anyone looked closer, they could see Thor was the only one who wasn't enjoying his time with his friends/team. He looked like he was in deep thought yet listening. Riza slipped her hand carefully into Loki's in hope to comfort him, letting him know silently that she was here for him