I believe some of the responses are a little TOO strong. Children DO exaggerate, I am not saying yours did but keep that in mind.
I would simply email or talk to the teacher (FACE TO FACE) first. IF you are not satisfied with her response and reaction, then step it up.
Teachers deserve to have parents speak with them directly before running to the principal or assistant first. I know most of them do work very hard to make sure they meet parents' expectations as well as the priority of educating our children. They deserve respect. In many cases, it is a simple misunderstanding.
Believe me, I have an only child, daughter, who just started 8th grade yesterday. I have been in the principal's, dean and campus police officer's face before and I would not hesitate to do it again if needed. On my daughter's first day of kinder she was dropped off at the wrong stop and ran home. Of course I was livid at the time but I also saw that my daughter was not incapable of getting herself home just fine. I underestimated my own child....
I substitute at only 1 elementary school in PISD. I have never seen, heard or ever told a child to hurry up or be left behind. That is cruel..... Most teachers I have met are very loving and nurturing.
As for Trish T. I am so sorry that happened to you. I don't know what district you are located in but with PISD, EVERYONE who walks in the door is checked, driver license scanned and if anyone is in the building without a proper badge or scanned nametag....Plano PD will be there in an instant. Cameras are installed throughout the building at all entrances/exits and in all hallways of the classrooms. This is also the way it is when I go to the Middle School where my only child, daughter is in 8th grade.
I hope it everything smoothes out for you. This is the first week of school and routines will be learned quickly.
Bless you for being such a caring mom.