I think with some teachers you will run into the following problem:
1. They don't think that ADHD is a real disorder
2. They will try to blame behaviors from the ADHD on her age rather than ADHD and gripe about how she was grade-skipped, if she displays these behaviors
3. Some teachers will simply not be good at communicating or following a 504. I had enourmous problems just getting 3 teachers to do this and they were all at a 504 planning meeting. I felt like the 504 was signed and then nothing changed, and wondered if they even read what they signed (although I think part of this was that our district is so horrible, the teachers had probably never even seen a 504 for ADHD before, and didn't understand that they were REQUIRED to actually follow it. Hopefully you're not going to deal with such nonsense).