Is she creeped out by me?

I held the door open for this girl at work who was walking behind me. She was basically arms length away. I glanced over my shoulder at her to make sure that I wouldn't slam it in her face accidently. She kind of slowed down her pace, stopped moving, and kept her head/eyes to the ground. I shrugged and let the door go and I knew she held the door to enter the building since there was no slam and her coworker said hi to her.

Other times, I'll notice that when we walk near eachother, she'll immediately snap her head in the opposite direction.

There are also times when I would walk by her as she is opening the door to the women's room (I would be looking at my phone or straight ahead to my cubicle area), and she would pause and kind of glance over her shoulder.

Then, there are times where I'll see her from far away, but I'll get the feeling that she's looking in my direction.

Then, one time we locked eyes with each other for like a few seconds in the hallway. She broke eye contact by looking down eyes first, then tilted her head down. Then the corners of her lips kind of pulled/twitched back for a nanosecond before her lips remained slightly ajar. She kept her head down and didn't move an inch as I walked by her nearly shoulder to shoulder. Her face wasn't turned away from me.

Does she think I'm a creep?

Is she creeped out by me?
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