She potentially participated in obstruction of justice; she (according to Mark Corallo) reassured Trump that the Don Jr emails about the Trump Tower meeting would never get out

She helped draft a statement defending Rob Porter in the voice of General Kelly. This was a major conflict of interest, because she was Porter's girlfriend. Further more, the statement came after the images of Porter's ex's black eye had been circulated and it came way after the FBI had briefed the White House these allegations. She was essentially sticking up for her boyfriend even in the face of credible allegations of his domestic abuse. That is majorly unethical conduct.

She was essentially Trump's walking email inbox. He doesn't deal with emails himself. Which leads me to believe that if he signed off on some unethical shit, there will be an email trail flowing from Hope's emails. That also means she was looking at said unethical shit and not telling the relevant authorities about it.