Technically speaking she's the Queen Metroid at this point too
If you kill her you find out you are responsible for the extinction of metroids… ironic
Samus Aran's last words, recorded via in-suit microphone: ooooh did somebody accidentally cause ecological devastation while thinking you were acting righteously??? Tried to solve a problem but your solution had devastating unforeseen consequences did it? Damn. I wouldn't know anything about that. Couldn't be me! Anyway good luck dealing with the X Parasite now biiiiiiii- (coughs up blood and dies)