I'm of the mind that the plan includes brexit. Cameron was mad to have a referendum. The result was non-binding. It was implemented anyway. May was elected for one reason only: to get the UK out of the EU. Except she did a deal with Merkel to keep us in. Or did she?
The UK provides a shed load of funding to the EU. How much of that comes from Queen Elizabeth, via the Virginia Co and the irs? In other words, the US is funding the EU. Hence getting the UK out of Europe has to be part of the plan.
My current prediction is that we'll discover on Monday April 1st that we left the EU on March 29th, because the extension was illegal.