Asking For Money Back

I let my friend borrow $50 almost 2 weeks ago. She was at a wedding and her SO forgot to give her money before she left. Her SO was heading to the wedding later that day. I sent the money via cash app. She told me her SO would bring the money to my house before he left for the wedding but I wasn’t home so I told her to bring it to me the next day...here we are almost 2 weeks later and I haven’t gotten it back yet. They were both at my house Saturday trying to make plans to go to the movies but neither mentioned the money.

How should I ask for the money back now?