Newbie - Does She Know?

OK I'm a guy. Question is does she KNOW I like her? I usually instigate most of our conversation. She'll ask me work related questions. I answer and make her laugh. But from a conversation thing, I feel I have to start it off. It's fine...she's pretty quiet personality, etc.

But some of the conversations I start are just so bad! When I think back on the topics, they're pitiful lol. Here's today:
She came after I did, asked how long I was staying (I have multiple responsibilities so my hours are slightly different).
I flicked her hair (mentioned length) to kickstart a topic. she brought her hair out the front to prove that it was long - v cut
We talked about the weather then she asked if why I was still there

I mention her to my coworkers to see if they know I like her but nothing. Her sister (also works) told me that I have come up at home.

I'd be amazed if she doesn't know I like her