TIFU by promising my friend a photocard

Hi there! Just for quick context, I (16f) and my friend, who we’re gonna call Emma (fake name for obvious reasons), also 16f, are both huge fans of Korean boy group BTS. Now the thing is, I own a lot of their albums and she doesn’t. We both own Jung Kook’s solo album and both only got one photo card (this is unusual because it’s supposed to contain two). I bought the Dark&Wild Album a while ago (before we met) and it didn’t have one group photo card but two, the same one twice. It has to be a mistake made while putting the album together because this one’s actually supposed to only contain one group photo card and one member photo card (I got two group photo cards with the same image and one member photo card). I always considered the second accidental photo card as the universe’s way of apologising for scamming me with Jung Kook’s solo album. I didn’t need the same photo card twice, so I put one in my memory box, I wanted something BTS themed in it. (I have accumulated a few other BTS themed things that I put in the box, so now the photo card is not the only BTS merch in the box, but it was my first one in there). To get to the point: One day, Emma and I were talking and I told her I had the same photo card twice and she jokingly asked if she could have one (she does not own that album, she only owns Jung Kook’s solo). I answered her, yes, she could. It seemed like a good idea, I don’t need that photo card and part of being a fan is the experience of the community and the sharing. When I agreed, I truly meant it. She asked multiple times over the course of a few days if I was sure, and I said, yes, because I was. But now, I’m not. I’m very emotionally attached to my photo cards, not as much to this one because I have it twice, but still. I did put it in my memory box and I had actually promised myself to not ever take anything out of it. I wanted to make an exception for her but I’m not sure anymore if that’s a good idea. I told her that I lost the photo card and would give it to her when I found it, planning to just wait until she bought her own album to see if she would pull the same photo card because that’s very much possible. I did tell her she should wait to buy her own as she could pull the saw card and she said she wasn’t planning on buying it any time soon, as she didn’t have a lot of money left after the concert ticket sale. She did say if she bought it some time in the future and happened to pull the same card, she would give mine back. Just to make clear, I own way over 50 photo cards, I would say close to a hundred, though it’s been some time I counted them. She owns ONE and that’s the one from the Jung Kook album. I do feel bad for lying and making her hope for a photo card and I feel like I sound very selfish and that I shouldn’t make a big deal out of it. I see her tomorrow again. Should I just give get over it and her the photo card? And if not, how do I go about this? I did tell her I lost it and could stick to this for a couple more weeks but it’s not gonna last long. It’s too late to tell her that I want to backtrack because 1. I made clear I didn’t have a problem with it and 2. she’s going to understand I lied when I said that I lost it. Please help me out 🙏 Thanks in advance.

TL;DR: I promised my friend a BTS photo card that I have twice and now I’m not sure if I’m actually fine with giving it to her.