To my horror, I just realized that I misspelled a guest's name on the invitation that has already been mailed to her (along the lines of "Sarah" when it's actually "Sara"). I feel terrible about this mistake! Should I reach out to her to apologize or just let it go and hope she is not too offended? I will, of course, be sure to have the correct spelling for her seat and thank you note when the time comes. TIA for your perspective and suggestions.