Why is my coworker touching me?

I work a second job for a catering business often in a cramped kitchen, a coworker, attractive short redhead always touches my back when she passes behind me. I get that it’s partly so I don’t back into her by mistake. She uses her full palm and touches me right by my neck, it feels so amazing and I love when she does it. Is this casual flirting or would she be into me?

Why is my coworker touching me?
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