Is cancelling Brexit the Prime Minister's new default?

Is the de facto Brexit default now revoking Article 50 this week rather than a no-deal Brexit on 12 April? I ask because the PM is now explicitly saying the choice is a binary one between some version of her negotiated deal and not leaving at all (that is what she said in her sofa chat on Sunday). The point is that she has no power to prevent a no-deal Brexit on 12 April by delaying Brexit; for a delay, she needs the unanimous agreement of the EU's 27 leaders. But she does have the unilateral power to prevent a no-deal by cancelling Brexit altogether, by revoking the Article 50 application to leave the EU. So, have she and Whitehall, who are persuaded (rightly or wrongly) that no-deal on April 12 would be a catastrophe (especially for the integrity of UK), made a huge emotional leap to prepare for the political (if not economic) explosion of cancelling Brexit this week - in that there remains a serious risk that the EU will not grant the UK an extension or an extension on acceptable terms.