I'm not sure what help you are planning to give. If someone with ADD fails (like if anyone fails for any reason), it is easy to develop depression. I mean, if you try and fail, that hurts. But as a friend, you cannot simply make her different so she can focus on school and keep jobs.

If someone sort of zoned in from above and told me they were going to "help me with my ADD", I would be mad too. It would feel very humiliating.