Anika, I'm glad you opened your mouth, coz THAT lady, is just thoroughly inappropriate!

No need for bad guilty feelings, and since you didn't get into a physical altercation, and work was not interrupted by your having words with her, your job shouldn't legally be on the line... management knows that employees have conflict from time to time, they are trained in conflict resolution bcoz its expected in a work place.

DHX is right, bullet points is full-proof. Managers usually have a ton of emails, so these are easier to read,and better for you, bcoz there's no place for misunderstanding, or word-mincing.

I would include feelings, as they are facts too.
- I dread coming to work

Is a good example of a feeling that is relevant to this email, as management should be aware of how this is impacting your working environment... Management WANT workers to WANT to come to work, so its very important.

Sending you lots of calming soothing s....
And remember, yes, you may have hurt her feelings, or whatever you call it, but how many times, days, has she not made you completely miserable, worked you to the bone? do you think she felt bad for sending you home to your kids in that state?...