Judging from the episode on the work retreat the block is pretty quick. If her father or milchick had the block to be switched off, and milchick, being right there would easily say something like, “mark is escaping with Gemma”. You don’t need that much more info.

She already said goodbye to him when she said I’ll meet you at the equator. So it just seemed odd she would do this.
But maybe it’s not. 🤷