Does the sound of the fans generally disturb her even when she is not trying to listen to the teacher or is it the stress of trying to listen and comprehend the instructions with the constant background noise going on that is the difficulty? Also, are the kids sitting in front of the computers listening to the teacher then told to go about their work or is she giving them instructions while they are attempting to accomplish a task? It seems to me that these distinctions needs to be made in order to identify a successful accommodation. They do make noise cancelling head phones that musicians use that might help her however they are not cheap and so I wouldn't recommend going that route until you understand the nature of her problem a little more. If the real problem is the stress of trying to focus on the teacher's verbal instructions while sitting next to the constant noise, maybe she could sit at a desk away from the computer while the teacher is talking then go to the computer to do the actual work. If the teacher's instructions are being given throughout the lesson while the students are working at the computers, I would suggest that she be front-loaded with the instructions, be given them in a written format and allowed to sit off by herself at a computer with headphones or earplugs. If she needs help, the teacher needs to find time to come to her and work with her one on one.