She did opposition research for Fusion GPS who was hired by the Clinton campaign. And perhaps another significant scandal is that the Intelligence Community contracted out Top Secret projects to dubious companies like this.
Nellie is lifelog, she was also spying on Republican members of Congress. Digging up info thru the FISC system, writing it up and feeding it back in thru her husband to the Peter Strzoks in the F_I. Keep in mind this was AFTER the C_a and F_I had set up Papadopoulos and Carter Page along with Jr. With the Russian Female at TT.
When Admiral Rogers shut down her and others access Fusion ended their contract with her.