Hi B.!
Here is the rub: the school is required to remediate issues so that your child is "functional" in the classroom. If your daughter is doing well otherwise, they are not required to remediate an articulation issue. Social issues related to speech oddites are seldom considered, and when they are, it certiainly is much, much more than the legal standard that any school is requied to follow by IDEA.
It is really funny that your teacher said she did not know. She knows. She has noticed your daughter's issue and knows that if she says something about it, the school is required to evaluate (a mechanism in IDEA.) She also knows that she would most likely be in trouble for triggering an evaluation that the school would rather not pay for, espeically since they will not be offering serivices unless there is an educational need (and she may even have been instructed that educational need means that her OAT's scores will be effected.)
Your best bet is to get some private therapy, which you will probably have to pay for out of pocket, but probably will not take too long to remediate.
Where are you in Columbus?
M.