Wait a damn minute..

mmm I feel like it’s not necessarily true that she has gone into the game before it’s more like there’s a different timeline in which she had completed the game that’s different from this one since only the ML is the one that regressed back in time (how? i have no idea…) So it would be hard to say she’s gone into the game before since she has no recollection of it happening

Yes!! It's like a time loop the she wasn't initial aware of!! But because ML has regressed she will probably become aware of it maybe.....ʅ(°▾｡)ʃ if he tells her about it....or maybe the dragon will tell her?.... All I know is that it feels similar to 'The Newbie is Too Strong' where he basically experienced the tower inna different timeline but then by some coincidence he became aware of it through a video file sent to him in his current timeline (it didn't come in the form of a person but a video recap instead) so its like not being aware of future that has already happened or is about to happen. CRAZY.