@futurebird it is possible that she just doesn't good spatial “awareness” (I'm not sure that's the right term?) rather than lack of trust, although this doesn't make it any easier to tell how much of it is nature and how much is (lack of) nurture. She wouldn't be the first person I know of with excellent abstract reasoning skill and no spatial intuition anyway.
(That being said, verifying the intuition even when the answer is obvious is a Good Habit
for a mathematician 8-D)