Maybe you can't understand but I'll try to explain why you are asking the wrong questions. 
It's not what Hillary can say or how much of Bernie's platform she says she will support. There is a huge trust gap that will be very hard to bridge. That won't happen with empty promises. It will happen with action. 
Adopting an anti TPP policy in the platform is not adopting more of Bernie's platform to appease his supporters, it's backing up her words (says she's against TPP) with actions (puts it in the platform.)
Aside from that, Bernies supporters have many grievances that need acknowledged and addressed before we can consider giving her our vote. 
It seems she would rather focus on attacking Trump than mending bridges. I fear that won't be a winning strategy but it's her choice to make. 
She can't dismiss the grievances and expect us to fall in line because Trump.