If you go on the ASA website and find the 'make a complaint' link (it has an orange flag next to it) there's an online form you can fill in. It takes maybe 5 minutes.
The only thing that's tricky is at the beginning it looks kind of like there's nowhere to complain but after the information about the form and what the ASA do, there's a continue button near the bottom of the page which leads to the page where you can report them.
Honestly I think yes, she is. She doesn't really get what people are protesting about I reckon and I bet that people from her white, working class area are talking about 'All Lives Matter' instead, because that's what people in my area are doing. So in a way I'm thankful that she's even raising up black creators as opposed to preaching for equality. It completely misses the point but since when does Demi go out of her way to educate herself? She's low effort through and through.