Of course, they are "under her control": if she had told them to increase security, they would have done it. And, of course, the staff and experts that slosh around her campaign and the DNC are likely later to get involved in her administration.
Clinton does not run the Democratic National Committee, Debbie Wasserman Schultz does - at least until the end of the convention. About 30 minutes ago, she announced she will be resigning because of this issue. Furthermore, the head of the Democratic Party is, at the moment, President Obama but, unless the duties for POTUS have changed and Obama has taken a Learning Annex course in computer system administration I don't know about, I'm sure he doesn't spend his days monitoring server logs at the DNC.
Certainly someone is directly responsible for not adequately protecting the DNC email systems, but it's not Clinton (or Obama). Ms. Wasserman Schultz had managerial responsibility and is owning up to the failures of this issue.
But, please continue to believe whatever fantasies you want about how things work.
I'm simply anti-Clinton because I think she is incompetent, deeply corrupt, and dangerous.
Have fun voting for Trump...