I'm a teacher and Im shocked at the unprofessionalism of her comments as well. I am always so, so wary of suggesting that a behaviour indicates 'x' because normally it could also be a symptom of 'y, z and a, b or c' as well.
Every child who has seen a paed for assessment during my time as their teacher has required me to fill in a questionnaire from the paed which I send back directly. Thishas also been filled in my school psychs and even the prior year's teacher if we're early in a school year.
I normally jump to the teacher's defence as we have a tough job and cop a lot of overcriticism, but in this case I agree to talk to the principal about what she has said as it sounds like she needs some extra training.
FWIW I would not be concerned about letter reversals not resolving until the end of year 1 at the absolute earliest and even then the idea that is it an indicator of dyslexia is an outdated notion not supported by current research. And don't even get me started on the Tourette's comment!
See your GP, get a Paed referral and get the ball rolling.