Girl DM's me but I'm not into her?

A girl from work asked me for my Instagram. She immediately messaged me saying hey :). I responded with "Hey what's up?". Her response was "Not much." I liked the message and left the conversation there because it didn't seem to offer anything and she was the one to message me. After I accepted her request, she also changed her profile picture and added a new post. Two days later she liked one of my Instagram posts from a year ago. After this, she also immediately just asked me "What's up?" out of the blue. What does this mean? I get the feeling she likes me but I'm just not into her. What do I do?

Girl DM's me but I'm not into her?
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