Eek, that is actually my comment! But her 'original' hair does look like a wig. It's too solid a colour and heavy (which is remarkable given how fine her hair is)
Like Sali (I've managed to spell her name correctly this time), I'm 30% grey and have used lockdown to embrace my grey. However, despite going to the hairdressers to speed things along, my colourist refused to dye my roots which is the exact opposite to what Sali has had done. And I agree with many that her hair is a light ashy blonde for the most part. The thing that is most apparent is that it just not a very good dye job. Luckily for Sali, she did not have to pay for it. I know if my colourist had done that to me, I'd have demanded my money back, had someone else to adjust the colour and started looking for a new colourist.
As I am new to this thread, I just want to say I have never been a fan of Sali, I have always found her disingenuous in the same way as Caroline Hirons. And having fallen for CH's schill, I saw through Sali pretty quickly. Also, and most pertinently, I just don't think Sali is a good writer or journalist, so mostly avoid her and her 'work' until yesterday on Mumsnet.