As far as we're aware, she's done nothing wrong at this point so there is no reason to pardon her. A pardon for Clinton would be devastating to the Democratic party because, whether she did anything wrong or not, for 4 years, that's all the Republicans will talk about in hopes to further suppress Democrat votes. They will sit there and say, we can't let another Democrat in office because they're corrupt and robbed the American people of their chance to serve justice and lock Hillary up and will completely ignore the fact that there was never any reason to lock her up.
We live in a post-fact world. In their mind, Hillary Clinton is already guilty of something and giving her a pardon would "prove" that the Democrats are corrupt.