I would guess as the moving out date gets closer, maybe she is feeling more comfortable as her exit strategy approaches, or maybe feeling a little guilt as it approaches. Not sure if it matters honestly.
I had a bit of an internal debate - on one hand, not accepting will give her a little preview of what 1/17 will look like, but if that's been how you acted previously, that might backfire.
If she is dead set on moving out, I think I would go. And focus on having fun, smiling, laughing; as much as possible. But when 1/17 rolls around, I would say cut it cold turkey.
Again, hard to gauge, so just giving you a viewpoint for what it's worth.
