What does that even mean now though? May was not originally sold on Brexit. Since becoming PM, what evidence do you have that she is not absolutely committed to Brexit? She may not be a True Believer, but she's a human apparently 100% intent on Brexit.

She's all about immigration, otherwise she would have opted for CU/SM integration and called it a day.

That's about the only thing I think she actually believes in. You only need to look at her tenure at the Home Office to see that.