If she falls on her sword after losing tonight, it will strengthen Boles/Cooper coup to have Parliament take over negotiations I think
If she stays, she would have to be persuaded to take the UK out on no deal. Remainers in the cabinet would leave. Labour vote of no confidence...
But they have said Boles/Cooper vote would not be binding and cannot overturn Law. I would have thought the default would always kick in? 3-4 ERG seem to think this as they have all said the same on TV.