A coworker who likes you will suggest after-work hangouts, often framing them as group events. Even with others around, if she consistently directs her attention and conversation toward you, she's testing whether there's mutual interest.
Okay, the second sign a female coworker likes you is that she suggests doing something after work. At first especially, she may include some other coworkers in that as well. "Hey, why don't, you know, the group of us all go together?" But this can be an easy way for her to, without being too obvious, get to spend time with you, get to know you a little bit better, see if you're attracted to her, see if she's still attracted to you as she gets to know you. It's when you take it outside of work, it feels a lot less risky. And even if she includes some other coworkers in the group, if you notice that she tends to focus her time and energy on you and wanting to be with you and talk to you, that is a huge sign that it's really just an excuse to spend time with you.
