The movie I saw about the student whose mother accompanied her was a quadraplegic, and they would have needed 3+ full time aids to do what the mother was doing. Mothers can work 24 hours a day, paid aids cannot. It seemed this was the arrangement the student and family wanted.
I do not believe the school needs to hire aids, signers, or guides, but must accommodate them if they are hired by the student. The school needs to provide an area for a service dog to be walked, but doesn’t have to provide a person to walk the dog. That’s one of the hot issues with young children bringing service animals to grade schools. The schools don’t want to provide aids to walk the dog(s) at noon or allow them on the playground without the student they assist.