Yes, Hillary Clinton is trying to hide something in her emails. As she continues to try to belittle the situation and not let anyone get into some of her important emails, there is clearly something she is hiding in the email server. Otherwise she wouldn't have kept it so secretive for all these years.
Hillary Clinton has not been very transparent when it comes to the private email server she used while serving as secretary of state. First, Clinton violated state department rules when she opted to use her own private email server. This raises suspicions that she might have not wanted others to see the content of some of her emails. Furthermore, after leaving the state department, she refused to hand over her email server to the department; instead deleting thousands of emails, before handing over the remaining. In short, there is a lot of evidence to suggest that Hillary Clinton is trying to hide something that was in her emails.
Hillary Clinton needs to be as transparent as possible in order to avoid arousing suspicion, especially when she is trying to run for President. The fact that she is unwilling to turn over key email at at time when transparency is the utmost importance is a big red flag that she is hiding something.
If Hillary Clinton has nothing to hide, why is she refusing the deliver email in question to the state department? I think it is because the implications of that act could severely threaten her chances of becoming US president. Even now, that decision is making her look very dubious, to say the least.