I think that you do not actually know this. You do not actually know what is on her mind.

I think that if you get the chance to be with her, you would be wise to listen.

In other words: Come in with no preconceptions about what has upset her. Simply listen, learn what is bothering her, say it out loud so she knows that you get it, apologise freely and sincerely, and do not defend or justify or your conduct.