I'm guessing she had probably been told by the ERG she would've been out immediately if she tried that. Let's not forget the ridiculous level of power they wielded for a while.
What an insanely bad list. I've gone May purely based on feeling - whilst I don't agree with her on many things - she's probably the most competent politician and I genuinely believe she tried to do what she saw as the right thing for the country with regards her Brexit deal.