I have a friend who teaches advanced calculus, and her spelling is not good. She has a math brain

I worked for a very successful, senior salesman for a major telecom company whose spelling was even worse. He has a sales brain

I could go on and on... you get the idea. Your daughter can say "I'm not good at spelling - instead I have a ____ brain!"
Although, I do think she handled herself fine in front of her friends. What you could do is focus on making her feel better about it. Give her as many real life examples as you can of adults who have been very successful in their careers and in sharing their ideas even without good spelling ability. Also reminder about spell check, and tell her they would not have invented it if there wasn't a need for it, so she is not alone in her spelling challenges.