Since she handed over a large number of emails, there's no reason to conclude she didn't hand over all the ones she was required to hand over.
No. The fact that she set up a home-brew system to avoid the State Department's record keeping in the first place, and the fact she's been stonewalling requests for official mail for years, and is her own gatekeeper on the message she decides State should be allowed to see - combine that with her long history of obfuscation, ethics problems, and working with her husband's supporters to engage in seriously sleazy tactics - the burden is very much on you to explain why you think her private stash has been delivered in whole and intact to State when everything in her history and everything about this entire scenario screams the exact opposite.
In fact, to plow through her "official" mail (you know, the stuff she couldn't be troubled to mirror in her department's archiving system the way that the 2009 regulation required her to do), she used employees of her family's business - and that operation is funded in large part by big contributions from foreign governments and other entities from which she solicited money while she was wandering the world as Secretary of State.
We know Kerry is doing things differently, due to a change in the law.
Both Kerry and Clinton were subject to 2009's regulation. But you already know that.
It is hilarious, though, to play back her nagging lectures about other people using private email at all, and to know that, for example, an ambassador from her department was given the axe for using private email.
The fact that you seem to anxious to write off her behavior as completely reasonable says nothing about her, but a whole lot about your very strange world view.