Skip the testing and look for accommodations that you can do.
I know a diagnosis is helpful, but it is not the end of the journey. It’s the start.
There a lot of good resources online (like How To ADHD on YouTube) that can help you find ways to improve her life.
There will be some trial-and-error; ADHD is not a monolith. And doing that, she might come across information that will demonstrate to her that does / does not have ADHD.
Some of the advice can also help neurotypical people, so even if she does not have it, it might still help her.
Skip the testing and look for accommodations that you can do. I know a diagnosis is helpful, but it is not the end of the journey. It’s the start.
There a lot of good resources online (like How To ADHD on YouTube) that can help you find ways to improve her life. There will be some trial-and-error; ADHD is not a monolith. And doing that, she might come across information that will demonstrate to her that does / does not have ADHD.
Some of the advice can also help neurotypical people, so even if she does not have it, it might still help her.