I think I would be worrying about every little detail, too.

Are there times when you can make a quick phone call instead of sending an email? The advantage of a phone call is that your boss can respond and let it go, whereas with email, she can ruminate over it, pick it apart and find fault. As well, her voice might be a good indicator to what she's feeling. The disadvantage is that there's no "evidence" to save in case she changes her mind and says that she never said it.