<human>: Can you summarize the given text in a few sentences?

So my situation is pretty much like what the title says. In late November, Cindy messaged me out of the blue to borrow money so she could pay her electricity bill. She PROMISED to pay me back the following weekend (December 5th). 

However, several days later I let Cindy know that I was going to be busy on Dec. 5th and asked her what other day would be good for her to meet up. Cindy then messages me that she wouldn't have been able to pay Dec. 5th  since she had to pay her rent. But she said would pay me the following weekend. (Dec. 12)

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And here we are. I haven't brought it up again in hopes she would, but she hasn't. Would asking her again make me an jerk? I feel like a loan shark, or I'm hassling her. 

I know people have advised against letting friends borrow money. But thinking back: we always had each others' backs at my old job, I could always depend on her, and we were pretty close when we used to work together. I'd known her for a about a year. So I thought I could trust her. I let her borrow the money.

I was waiting to bring it up til after Christmas, if at all. I understand that she might be dealing with other bills or holiday spending for her family. I don't want to burn bridges with her. I still like her as a friend- but I still would like to be paid back eventually. How should I go about this?
<bot>: Friend hasn't paid me back money I had let her borrow.  Unsure how to go about asking her for the money without coming off as an asshole, or if I even should