She has a small majority now - she reckons that Labour are weak and that she will get a bigger majority and that the opposition in parliament will be significantly weakened.
This is my opinion too, and she will likely succeed.
But I think it is less to do with getting one over on Labour,
and more to do with overcoming persistent Remoaner drag.
Taking nine months merely to send a letter was not a good omen.
While she no doubt expects opposition from the other parties in Parliament and the rebellious Scots,
her experience of persistent opposition from three areas: the judiciary, the House of Lords and in
particular from within her own Conservative party too; has probably led her to very reasonably anticipate
more opposition to come, and rather than look forward to swimming through the treacle swamp;
she has, I suspect, now decided that it is best to raise the issue to a back us or sack us level.