Anxiety attacks at work and friendship problems

I had a little fight with my best friend, who also works with me, in the office, so we haven't been able to really talk. This gave me an anxiety attack, because even though I think we both made mistakes, I also think I could've been more understanding. I sent her a text explaining my reaction to what she said to me and I apologized; I told her that I knew it wasn't about "because she did it to me, I'm going to do it to her too", that I knew she had had a rough night the day before, that I would never do anything to hurt her on purpose, and I knew that she wouldn't do it to me either... I also said I was going to be more careful in the future... She didn't reply and afterward, she said she was still angry with me.

I love her and I really don't know what to do. I don't think this will ruin our friendship, of course, but it hurts me to know that we wronged each other.

Do you have any advice?