@whippy1981 You keep banging on about "biological need" like it's some huge "gotcha". It's so weird. If you break your leg and take paracetomol, codeine or ibuprofen, you do know that none of those drugs actually CURE the leg right? They simply help to manage the symptoms.
As for mental health and neurodiversity we don't know how much is "biological" and how much is psychological, trauma etc. We DO know that in many cases the meds help to support the patient and relieve symptoms, allowing them either to address the underlying issues or to improve their quality of life.
It's fine for you not to want to take medication or to consider altneratives for any mental health issues but your rather incoherent ranting suggests you don't really know what you're talking about and it's strange that you're so upset that OP is considering meds for her dd.
As for what it does? Well, in the caes of my ADHD DS, the meds calm his brain so that he can actually focus. When he's playing basketball at home he doesn't need his meds to focus and concentrate because it's calm and quiet, but on a busy court, without his meds every other bouncing ball, every shout from a spectator, every person running past is a huge distraction and very difficult for him to manage. Which is frustrating for him because he loves basketball and is good at it. Many ADHD children will actively seek to take their meds because the chaos in their heads, which translates to chaos in their lives, is very distressing to them. smart ones especially find it frustrating. Of course, you may not consider this valid as ADHD is a "biological" condition and while it's not fully understood as yet, it's recognised as such, and, in fact, responding to meds is actually considered part of the diagnostic criteria. But we DO know the meds don't solve the problem, they simply help to manage it.
Anti depressants have a similar effect and I know most professionals want their patients to use meds in conjunction with other therapies - rather than in an attempt to just solve the problem with meds. You watch someone who has been barely able to function (and usually feeling guiltly, stressed, sad about it) suddenly start to be able to do things and engage with thei rlives and believe me, you'll be a fan of the meds too.