Ah man your mom let you have TWO miracles?? Lucky
I was honestly expecting the bully to show up and help pull her up, and while that may have been hokey at lease it would have made sense
I headcanon that this is what really happened and Eunha remembers this right after she sees Suyeon in the hospital at that last scene.
Also we need an epilogue focusing on whether Eunha truly traveled back in time or just hallucinated everything while unconscious in the hospital.
I got to thinking that if there is a supernatural influence here, one that sent her back to give her the chance to save her, and because she was able to reach out to her and express her feelings BUT still didn't manage to save her, the influence took pity and saved them, and she would wake up back as an adult and in a relationship with the price being she won't remember the 10 years they had together this time.