I think the explanation is pretty simple. There are two fractions in the dimoKKKRAT party. One is pro Hillary and the other is sick and tired of the Clintons running the dimoKKKRAT party. Donna belongs to the faction that is sick and tired of the Clintons and their shenanigans and are trying to take Hillary down.
I think Seth Rich was part of that branch and they killed him for leaking the emails. You will notice that she mentioned Seth Rich in the dedication of her book. IMHO this is not a mystery.
I think Donna sees the money that went to the Clinton Foundation as belonging to the DNC.
+1