Connection fading with online friend

So I (M18) made an online friend (F19) last year. I am not normally the kind of person to make full on friends over the Internet, but we met on a game we both played, started talking and had SO much in common. Things went amazingly and I felt such a unique and nice connection with someone I knew so little about, we never face revealed or even called, but we would DM all the time and play games together pretty regularly. It got to the point where I would sometimes prefer talking to her over my irl friends. Eventually we started opening up about our personal lives too and it was nice to get an outsider opinion on things in my life, and vice versa. Things were like this for several months late last year, but then she out of the blue stopped responding as fast. At first, I thought oh maybe she's just stressed with irl stuff y'know not a big deal, but it never went away. She began to suddenly SUCK at responding I would start a conversation and not hear back for days, and we barely played games together, etc. I kept telling myself we're just online friends, I have no right to say something about how much this is upsetting me because we both have lives, but it really was upsetting me. I'm a very emotionally dependent person, and even though I am lucky enough to have irl friends and a life outside of the Internet, she quickly became one of my favorite friends and I was so hurt seeing her start to ghost me. Over the next few months we'd stay in touch from time to time and sometimes it would get better, but it would keep going back to the way things were. As of recently, we talk again occasionally but she still sucks at responding and ik she sees my messages and ignores me, and we no longer talk about anything personal, it almost feels like I'm a chore to her. She's even made several other friends on the game we normally play together, which is fine I'm not upset by that at all, but I would always invite her to play with me and my friends whenever we got on and she didn't have anything to do, but she's never done the same for me. I want to confront her and explain how badly I was hurt by her lack of explanation for how our relationship is borderline gone now, but I'm afraid of losing what little connection we have left. What should I do?