Forgive or forget (Green Flare's night)

The picture I found on deviantart. Makes a good cover I guess
When a peashooter named Stella becomes Green Shadow, she met a Fire-Flower-turned Sunflower named Summer who became Solar Flare. 15 years had past but Stella has a secret. A secret that could ruin their friendship and kill Stella herself. Should she tell, or would she feel sorrow about what Summer had become after an unfortunate event?
P.S You can check out the original here:
https://www.fanfiction.net/s/12037752/1/Forgive-or-Forget-Green-Flare-s-Night