The thing is, what she discarded, her private and personal stuff, was NOT subpoenaed by Congress....she had every right to discard it, because at that time in Jan/Feb...time period....
the republican Congress critters investigating Benghazi, ONLY Subpoenaed any emails and documents on Benghazi and Lybia. Not her other work emails or private Clinton Foundation type emails were subpoenaed. NON, ZIP, ZERO of what was bleach bit was under subpoena! That was all a false, created, narrative....
She turned over all of her work related emails in December....her lawyers went through and pulled out work related stuff and turned it over, what was left on the computer was her own stuff not related to work and no Benghazi/Lybia stuff.
ONLY in the following August, her SERVER was subpoenaed by the FBI, because when the National Archivists began sorting her emails to organized them for FOIA requests, they found 4 emails discussing top secret stuff. The National Archives then got the Inspector General and the FBI involved per their protocol, on this kind of stuff so the FBI could do a risk assessment on the top secret stuff...
And THAT is when her subpoena was served by the FBI for her entire server....in August, 6 MONTHS after the congressional Benghazi/Lybia subpoena and bleach bitting.