No. IMHO this is not a valid reason to single your child out from every other child, to point out a so called “flaw” that the teacher can’t handle, or has decided not to, in a letter that has no educational basis.
Did you actually talk to this teacher?? Other aides in the classroom? The principal of the building? You’ve lost a great deal of power in this situation by waiting if you didn’t. It also shows subconsciously to your DD that it’s her fault, her issue & she’s not conforming.
Are you advocating for your daughter & does she SEE this.