From people I know who've been in the ctf in the past, they basically are either on the floor or thinking about/developing solutions every waking minute of their day. So no real time to hang out with someone else.
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It is important to not promise kids things you don't intend, or might not be able, to follow through with! But there are lots of promises in the world that come with an invisible footnote that says '*Within reason', and it is a good lesson for your daughter to learn here.