She knew that her Credit card would be tracked. And if she premeditated advance reservations, then who knows who fast it would have shown up in any alert system? OR if John even knew she used it?
Since she premeditated her AWOL, she thought out most everything, right down to cutting her hair. Sort of puts an end to her story that she didn't know people would be looking for her. She didn't want to be recognized.
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But she didn't take any change of clothes. I don't think this was thought out well at all.