Many public libraries have grappled with the same issues, so looking at how other librarians have worked to make their libraries accessible is a good start.
Thanks for going the extra mile to help this young woman. There are actually several underlying issues related to your question. Can this student use any kind of computer technology?
We have a whole host of tools these days. One interesting thing about students with ADHD is they often have real difficulty with the perception of time.
Your problems are serious and I am sorry you find yourself where you are now. It is possible that your depression is the result of your years of frustration and failure.
ADHD is a neurological disorder present at birth. Thus, the history of hyperactivity, inattention, or impulsivity has been noted since at least age seven.
Go to the Office of Disability Services at the college you attended (or the one closest to you). Ask for names of professionals who evaluate and work with adults.