She can’t. George Soros funds and leads BLM through shell groups, and Hillary is beholden to George and will never ever not do his bidding. They have an unholy and devious alliance.
She can’t dump them, she needs the black vote to have a chance of winning. She currently is probably not even close to the levels of black votes el-presidente’ got in 2008-2012 so she needs every black vote possible. If she turns on the terrorist group BLM she loses significant numbers.
On the other hand her lecturing white white voters for allegedly being racist is pissing lots of white voters off. She is stuck betwixt and between.