Coworker (F) texted me "I want to be close" off the clock. What does she mean?

A coworker and I have been talking outside of work. Out of nowhere she told me, "I want to be close." I'm not sure how to read it. Could she mean emotionally close, like friendship or a deeper connection? Or is it romantic or physical? We work together, so I don't want to misread it and make things awkward.

How would you interpret this, and how would you respond?
Coworker (F) texted me "I want to be close" off the clock. What does she mean?
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