I think that Salsa dancing in a club atmosphere actually helps with the problem of overthinking. A follow who thinks consciously about her movement isn't able to respond fast enough. If you want to consciously react to stimuli you simply need at least halve a second for the mental processing. Because body tension travels faster than nerve impulses it's even better when some decisions are made by neurons outside the brain.

If she overthinks dancing, she won't be able to respond to subtle changes of the leads that derivate from the patterns that she remembers.