Whatever decision you make - just make sure you make an educated decision.

As far as the research goes the evidence is not strong that diet etc will 'fix' the problem.

Think of it like this - would you hesitate to get medication if your child had epilepsy or diabetes?? Psychological disorders ARE medical - so by trialling the medication you will be able see how she reacts to it. I also agree that this may be the perfect time to trial the meds - if she reacts badly you have time before school starts to get the mix right. Also it can take a few weeks for the meds to kick in properly.

As a psychologist working in schools I see lots of parents reluctant to medicate (and of course the opposite - parents too quick to medicate) - there is no shame in your child needing this support even if it is so you can get something done for 5 minutes!! as long as medication is not the ONLY strategy you use to support her behaviour and learning.

Maybe the next step is to get some guidance re: behavioura strateiges that could support her to self monitor and control her behaviour at home. This will be equally as important - and will ensure you are not relying on medication alone.

There is some evidence that natural medication - efalex - is supposed to help with concentration (I'm not sure how strong the research is, but it could be another thing to try)

Be careful about subscribing to the 'pop' psychology strategies - and make sure whatever you try is an evidence based intervention - that is, it has a research base proving it's effectiveness in adhd populations (for girls!)

good luck!