As far as I understand it these are the possibilities now:
Despite May's best efforts to obliterate all support for her deal, MPs become scared enough of no deal or no Brexit (depending on which side you're on) to pass her WA. Remain/soft Brexit people probably could amend it with something, as they're the biggest group, but I don't think there's time for PV before 22 May.
May's deal fails, short extension therefore unpossible, EU decrees an emergency two-year extension conditional on PV or GE or both, MPs vote between long delay or no deal. May surely a goner by this point.
Yeah, but option 2 still has to be first offered, and then accepted. If TM wants to, she could not just accept it - I'm unclear if the final say can be taken from her hands, and how this happens.
As far as I understand it these are the possibilities now: