It's possible what the teacher is referring to is DEST. Dyslexia early screening test.
It can show the strengths and weaknesses and learning styles and highlight possibilities of dyslexia in reception children.
Often it's referred to as specific learning difficulties.
I would worry less right now about what is causing the delays or difficulties in learning and how to support dd.
Firstly by putting the ball firmly in the schools court.
Email senco, teacher and head (copy into same email).
Thank you for highlighting your concerns re DDs learning in xxxxx.
Thank you for informing me on x date she shows possible traits of dyslexia. Could you confirm how this was established?
Could you please email me detailed information of the input ds is having with regards these areas of need so I can also support her at home.
Thanks
Xxxxx
This actually then requires the school to either admit they aren't supporting (not ok!) and hopefully if they aren't they'll realise you're on the ball and put something in place.
It's easy to see traits at a young age but very difficult to pinpoint a cause. It can just be delays in development and that's actually more common now due to lockdowns etc.
My ds has traits of severe dyslexia but because he has a physical disability which makes writing very difficult and is autistic so has communication difficulties this is the actual cause. It just presents the same way.