You can infer all you want and are likely on the right track, however, she did not say she was going to look into defunding public schools teaching black history as that Tweet implied.
You're 100% right.
But, given the actual context of the Trump administration and the long history of white parents not wanting anything not "I Have A Dream" (it's been decades and white folks know that one speech he did) taught to their delicate white babies, one wouldn't have to stretch MUCH to believe that to be the case.
(Excuse my run on sentence)