The chance of her resigning was 100 percent
There was no odds about it. They were real people and they were not going to vote for it.
Because in real life you can't stay prime minister when you lost both your majority and your single defining policy.
And that's how real life works.
And at least one party will have another referendum in their manifesto, and that will force everyone else to offer one as well.
And that's how real life works as well.
Approaching zero, and falling all the time.