Look at Bey .56-1.22 of the video, it looks as if she is giving Jay an earful and several times he points at himself as if to say "it's not me, it's her..." You can tell by her body language and the way she is looking at him that during that time that she is giving him some mouth. Never does she seem to be telling her sister to calm down. So whatever had Solo upset, I think Bey felt like she had a right to be upset about it.