According to the Guardian today:

The prime minister pledged in parliament to put her deal to the Commons on Tuesday but she is being urged by senior Conservative MPs to pull the vote if she fails to secure significant concessions from Brussels.
Leading Tories have warned Downing Street it could face a three-figure defeat similar to the historic 230-vote loss in January if the government goes ahead.
They have advised her instead to replace the vote with a motion setting out the kind of Brexit deal that would be acceptable to Tory MPs to keep the party together and put pressure on Brussels.

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You have to admit she has form in pulling votes. I have been dubious of the Labour idea that they will drop the Kyle amendment from Tuesday, and bring it in later, perhaps on Wednesday or Thursday. The risk of that approach is she could hold Tuesdays vote then pull the others. I wonder if these 'senior Tories' genuinely believe the EU will respond to such "pressure" or if is no more than a technique to reach the 29th so we drop out automatically.

I don't think she will pull Tuesday vote. I think it quite possible what she says immediately afterwards will show she will continue to push for her deal while doing her best to block any alternative.