Why would a woman (complete stranger) hang around me all night at a bar?

libsaretards
My apologies. This is a long post. If you do not feel like reading the whole thing, skip to last paragraph.

I went out drinking a week ago. I was alone. A woman approached me and we made some small talk (nothing of consequence) then she went back to her friends. I noticed she was keeping an eye on me anytime I looked around. Once I went to go talk to her but she quickly went to her friends. However, I noticed she was still watching me throughout the night.

Toward the end of the night I went to the restroom. When I left the restroom I noticed she was nearby again. That could have been a coincidence so I went back to my spot to drink until closing and got a new drink just to be safe. About 30 minutes before last call, I again notice her staring at me, alone this time. Finally, when I was leaving and getting ready to call an uber, she approached me and we chatted a little bit.

What creeped me out was she knew what hotel I was staying at despite a bunch of them being in the area. She was also telling me about how ubers in this area are hard to find and offered for me to join her since the hotel I was going to was on route to where she was going. True to what she said I had a hard time getting an uber so I took her up on her offer because I figured between the uber driver having a dashcam and it only being one girl I could handle myself and I did not feel like walking 5ish miles while intoxicated. During the whole ride she was quiet but kept looking at me with a smile.

She got me to the hotel without any real incident and was very nice, but I found the whole encounter weird. I also noticed a business card with a female attorney's name and number in my pocket despite me only talking to one woman the entire night and I did not ask for her number. I'm puzzled how she got it in my pocket without me knowing. There was only one possible moment in the uber she could have done so but a few at the bar. What are your thoughts on this situation?
Updates
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After talking with Kkstarzz96 and DarkWinterNights I decided to text this woman just now. I did not expect a response so quickly. She actually texted back and said she was watching over me because one of her friends had threatened to spike my drink. The reason she was alone later was because she called the cops and that friend got arrested and the other friend was pissed off and left. The moment I was looking at my phone to order an uber was when she gave me her card.
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I texted her back jokingly saying "Damn so it was not a date invitation lol jk". She texted back "It can be if you want it to be". Either she is the world's most elaborate liar or I'm in for a treat XD
Why would a woman (complete stranger) hang around me all night at a bar?
6 Opinion