I think she knows she will have a hard time among independents. I think she wants to keep personal things personal. She has been through Whitewater, Paula Jones, Monica, Benghazi and much more. This e-mail controversy is just the latest. I think James Caravel had it right, he said Hillary just didn't want Republicans going through her e-mails is why she kept a personal e-mail account instead of a state department one. Perhaps in the end, she just ties of all the dirty laundry and muck raking.
Still, there is nothing solid to go by. Just a hunch.