I am pretty ignorant about computers .......... OK I am very ignorant about computers but aren’t her emails still on the computers that she sent them to?
Yes, on her co-conspirator's computers. Not that she would ever endeavor to do something unethical or illegal, mind you.
Doesn't matter about pressing for access to her server, as any IT person can pull the hard drives and insert new wiped hard drives - a search can't reconstruct data that was never there on new hard drives. The original hard drives are long gone.
So best way to find out what was going on, is to reconstruct the emails that went out on the Internet and may be floating around in caches at hosts, or on sender/receiver platforms. Some stuff floats around for years on the Internet.
Someone digging deep enough can find it; but they might be found dead of apparent suicide as in other Clinton stories.