Mrs May has a 14 point lead in the polls and justification to call an election were Parliament to block Article 50. Given the current state of the opposition, their leader, and the fact that many Labour seats voted Leave it is a pretty safe bet that the Conservatives could end up with a 100+ majority. The key thing comes down to what "block Article 50" means. If the Government decide to not give ground during the Par…
1) an early election would require 75% majority vote in the commons. Unlikely as labour would be wiped out (they'd have to vote for it).
2) The Tories are utterly scared of UKIP, an early vote if the economy is in less than great health, or the effects of post brexit globalisation become clear, then UKIP will hold the balance of power.
3) The real power in the tory party it's self is not with May and the government its with the 1922 comittee, who are an odd mix of libertarians and ultra nationalistic types. It would be them driving the purge not May. That scares May.