"gets rid of:
(a) likelihood of no-deal (because MPs won't vote for it) and
(b) excuses that we have to leave because the EU won't "let us" change our mind now"

And for that reason she's switched from "my way or hard Brexit" to "my way or Remain" which is exactly what a second Ref ought to be asking. I think the hard men are going to have to find something pretty special.