Wondering if coworker is interested?

There's a coworker that seems to flirt. We text throughout the day at work, so get a vibe she might like me or at least be cool with me. We work in an office, a couple times at the end of the workday there were four of us left including the girl in question. When she finds out the other two are leaving she leaves with them, seemingly not wanting to be alone with me. Should I see this as a sign she's not interested in me?
Wondering if coworker is interested?
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