Should I reach out to her?

Last week I was working, and met a cute girl. We hung out all day for work, and met up at night for work as well. She was telling me her weekend plans of having wisdom teeth removed, and just basic stuff! She seemed really cool, so I added her on FB. Now, I haven’t had to work that job, and she may not be working this next shift, but with her added, I was wondering if I should reach out to her and initiate conversation, or should I wait for her to message me?

I found she is 5 years younger than me, which isn’t a biggie, but also something I figured I’d mention so all details are presented. Should I go for it, or not?
Should I reach out to her?
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