She's a co-founder of BLM, not a "leader" or a "manager." Also, based on the clip from the Marc Lamont Hill show (he said the critique came from the left) and the NY Post reporting, it is not just rightwingers that have an issue.
From the post article:
Hawk Newsome, the head of Black Lives Matter Greater New York City, which is not affiliated with Khan-Cullors’ Black Lives Matter Global Network Foundation, called for “an independent investigation” to find out how the global network spends its money.
“If you go around calling yourself a socialist, you have to ask how much of her own personal money is going to charitable causes,” he said. “It’s really sad because it makes people doubt the validity of the movement and overlook the fact that it’s the people that carry this movement.”
Newsome said, “We need black firms and black accountants to go in there and find out where the money is going.”