I would feel upset about it. I wonder what was your “friend’s” motivation? She definitely undermined you and made you look bad. Maybe she just wanted to feel important? She was completely out of line for butting in and IMHO not a friend.

But there’s a lesson to be learned here, that I have learned the hard way, and still struggle with. When you said those things you gave her the ammunition to use against you. Sadly, we really can’t confide in friends information that can hurt us because— see what happened?

I hope you will get that job and succeed in spite of this. I’m not sure what kind of, if any, damage control you should attempt. Hopefully, you are so outstanding at what you do that you will prevail.