It would be unusual for the teacher to control this process. She probably meant that she would formally request the initial screening committee meeting.
In most districts, you make this request of the counselor, school psychologist, or assistant principal. In our district, you can to make a request, in writing, to any one of these people to start the process. Generally the first step is to request a "local screening committee meeting for the purpose of determining eligibility for a 504 plan under the IDEA act".
Some districts have a particular form they want you to use, but often that can come after the initial request.
I would contact the school ASAP because this process generally takes several weeks.
Beth, mom to older DD (8/01) and younger DD (10/06) and always missing Leah (4/22 - 5/1/05)