(1) It's not whether to Brexit or not because that has already been democratically decided by the voters. (2) If there are any counterproposals (i.e. another party saying "we'll do Brexit this way") then she'll have to clarify her strategy. If not, it doesn't matter anyways (the democratical choice of a single option is that single option).

The only problem I see with this is that the election is only 6 weeks away, too little for any credible new stances to form. Beneficial for her & Tories, but undemocratic and bad for the country.