As others have stated, there is NO "Disability Pass." There is also no pass to reduce wait times. There is a Guest Assistance Card, which can help alert CMs to invisible disabilities.
As someone who has ADHD (combined type, diagnosed age 15), and uses a GAC, I can honestly say that good planning and use of FP is going to be more useful. GACs cannot be used for shows (you have to wait for the next show, which can be 35 minutes in the case of Ellen), parades, fireworks, buses, restaurants, stores, anything in DTD, or anything at the resort. And even a lot of the attractions that are rides, I wait as long or longer for the rides. Often times the waiting areas that can be provided are in full sunlight (thinking of the wheelchair line for BTMRR here).
Definitely go and talk to Guest Relations about a GAC! Having one is a life saver for me, but honestly it only helps so much with the ADHD parts. How old is your DD? There are different coping strategies depending.
Also you are going at a very crowded time (spring break). things will be very crowded aside from the ride lines. In fact this might be some of the easiest to handle from a ADHD perspective.