Accidently called my interviewer “dude”; im so embarrassed

I (college student looking for a coop) was probably having one of the most comfortable and laidback interview experience at a company I really want to work at. I was trying to express my gratitude at the end for providing a great interview with me and I lost my train of thought, and I kid you not, I accidentally said “dude thank you for this conversation”, to the interviewer. I immediately said “sorry, sorry for that”, in the most awkward tone possible like and completely destroyed my confidence. She was a middle aged woman btw. I am so embarrassed but I think she took it well and thanked me for my enthusiasm. Did I ruin my chances?