The problem is she's frit. She was evidently horrified by DD's planned Brexit (being achingly burecratic and british by going through every scrap of paper the EU has ever signed with a third party and going "Can we have that? Can we? Can we?") which would've been Brexity enough for the vast majority of leavers and remainy enough that, aside from a few grumbles, there'd be enough similarities to keep them happy.Let's just remember her for the Lancaster House speech. In fact if she'd done what she said then rather than the exact opposite she'd have been a great PM.
No backstop bollocks, no real need to achingly check things as they'd be on mutual recognition or EU standards anyway and cameras where needed to do the majority of customs checks (as actual customs checks are predominantly done these days anyway).
Instead she got scared, and tossed all that out while putting her own ideas in.
Honestly, we'll need a new party rising to put their feet back to the fire.