Is my female boss being friendly or harassing me ?

I don't know if it's harassment, her being friendly or she's wanting something more and I'm very confused about it and haven't laid a finger on her.
I work in a warehouse with her and she's recently divorced and in her late 40's and very flirtatious with me and has been a supervisor over 20 years.

I'm male and in my ninth week at a new job in a warehouse and within the first week my female boss and i started talking about how we both use to work at the same company at different times and how working at this new company was a refreshing and relaxed change and while we were talking, she started rubbing the middle of my back straight up and down with her hand and that's the day that it started.

After that she has come up from behind me 3 different times and put both her hands around my neck for making a data entry mistake, patted me on the back as she walked by me, and started bumping her hand on my thigh to talk to me.

She's asked me to dance with her in the warehouse in front of coworkers and even asked if i was going to whip her one day when my belt broke loose while putting boxes on a skid for inventory.

When i was putting boxes on a skid one day the bottom of a box broke open letting glass bottles break on the floor and when she seen it, she told me to come over to her and she playfully slapped me.

This last time i was bubble wrapping glass bottles for protection for shipping and i had a large roll of bubble wrap at my feet on the floor i was using and she came over to help on the other side of the roller conveyor and looked at me and said gimme some, so when i started to bend down to get her the bubble wrap, she said to me, If you think i'm going anywhere near down there to get the bubble wrap from you, your crazy, well, i didn't say anything to her but, just looked at her confused and was saying to myself, i wasn't expecting you to go down at my feet to get the bubble wrap but, i felt she was implying something else, maybe I'm wrong.