She's doing her job and getting paid to speak with all kinds of people and will forget the interaction in 15 minutes - so allow yourself to forget it as well. This doesn't matter, this wasn't anyone you need to impress, just take a moment to be like "Man, I fucked that word all the way up!" and then move right along. I think we as stutterers internalize it as a deep personal flaw so intensely, it can be hard to realize that most normal mature adults do not care at all. For the most part, people are not going to make fun of us as they might have when we were kids. Most people are patient and kind and will overlook it and just be like "Oh okay, this person stutters, got it, no problem" and then move on, just as they would with someone disabled in any other way.