I will try to assist you.
How old is your daughter? Does Mc Donalds know she has a disability? What is her disability?
The first thing you have to know is that since she is a minor, any legal action to be taken would have to be taken in your name.
Secondly, unless McDonald's knows that she is disabled, or believes that she is disabled, they do not have to accord her any special treatment under the Americans with Disabilities Act.
In any case, the first thing that must be done is to file a complaint with the EEOC against MsDonald's alleging disability discrimination and hostile work environment. You can contact your local EEOC and they will discuss this case with you and advise you as to whether you do have a complaint, how to put the complaint into words, and what their process will be. There is no cost to do this.
You cannot take legal action against them until you file a complaint with the EEOC and let them go through their adminsitrative procedures.
Hope this answers your question.
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