You definitely need to see the GC and let him/her know what is going on in your house so that you can have this lab fee waived. Make sure that your D signs up for free-reduced lunch (it does not matter whether or not she eats it).
If your daughter has been diagnosed with ADHD, get her an IEP while she is still in school. This way she can get extended time on her SAT/ACT. In addition, she will be able to register her IEP at the office of disability services to get extended time services when she goes to college.
Getting the IEP will also be the first Step (she will need her IEP/504- get the IEP, it has more long range protections) in your child getting services through Maryland’s office of vocational and rehabilitative services, which can also get her additional monies for college
http://dors.maryland.gov/consumers/specialized/transition/Pages/parents.aspx