I have been scammed by a former "friend" how can I take legal action?

Anonymous
Long story short we were roommates at a shelter and she has been staying there for about 2 months and had recently moved out of the shelter. Nearly two weeks ago, she texted me asking to borrow money $50.00 from me through via cash app and pretends to pay back the money but never did and even agree to pay it back through texting because I still have all of the text messages that she and I have exchanged and yesterday I even texted her asking her when will she be able to send me back the money because I am low on funds and she never responded and I've even called her today and left her a voice message and she never responded. So how can I go about this because there is no way that she should be allowed to get away with something very deceitful.
I have been scammed by a former "friend" how can I take legal action?
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