Destroying evidence. Refusing to answer questions in an inquiry. Yeah that's obstruction of justice.That's usually called "obstruction of justice" and was one count in the indictment of many in the Nixon Administration.Folks don't usually take the 5th unless they have something to hide or don't want to reveal something.
Wonder how many of her other aids will take the 5th???
When someone is on a fishing expedition, it is not wise to provide them with more bait
Taking the Fifth is not obstruction of justice, even for Nixon
With Reagan it was called...."I forget"