I don’t think the transcript would speak for itself because the transcript would not note the disability that caused your D to not take foreign language. I imagine a college would want to understand why they should waive that requirement for your D.
I would have your D contact the Admissions office at the college to discuss (if there is a good guidance counselor she could work with him/her to do this in the fall). Find out exactly what has to be documented and how they want it to be done – that way Admissions can understand why there is a need to waive the foreign language requirement for admissions.
I would also discuss with your guidance counselor if your child’s disability and why it impacted his/her ability to take foreign language should be mentioned as part of his/her letter of recommendation to colleges. That is a personal choice.