I recently became close with a coworker-- we've been out a few times, talk almost every day and she's been helping a little with my wedding planning and she knows all about my upcoming wedding this June. Because we recently became friendly, I didn't mail her a save the date when I sent them out months ago. My question is, is it appropriate to send her an invite to our wedding? I don't want her to feel like an after thought or B list guest. Thanks!