This may be something you can address without changing the IEP if the teacher is reasonable. I would start by asking her directly - she may be willing to just agree to do this. If not I would contact the director of your team and ask for the modification. We have had a number of things added without a formal meeting. As long as there is consensus the IEP coordinator just writes it up and we sign off on a paper indicating that we agree to the change without a meeting. If they don't agree then request a meeting to amend the IEP. You can do this at anytime.