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Well, you may now have a reputation at school as a difficult parent.
The correct approach would have been for your daughter to approach the teacher first since it's probably a simple typo.
You "always" address things with the teacher alone first. Simply save a copy of your email. You don't CC a principal over 2 points on a quiz grade when you haven't even addressed this with the teacher previously. Give the teacher a chance here instead of upping the anty, which is what you just did by emailing the principal too. It doesn't make it seem more "urgent" to the teacher. Instead, it gets your daughter -- and you -- put on her mental list of difficult people to deal with, and can affect how she acts toward your daughter at school. Plus, parents & kids who are consistently a problem for teachers DO get mentioned to other teachers, so the reputation can follow your daughter from teacher to teacher and from one school year to the next.
It's best to avoid this type of issue over "little" things (and this really IS little). Take things one step at a time next time.