It would make more sense if Samus' PTSD was tied to Mother Brain. At this point in the story she just got done seeing mother brain wipe out a baby Metroid that she got warped paternal feelings for, she also is this giant disgusting robot creature she hadn't ever seen before. Other M would work as a title too, the other "M" aka "Mother" actually fucking means something when Mother Brain is the villain. The fuck is she so scared of Ridley for, anyways? There was such an easy fix for this game's story and design, while still keeping this broken Samus story they wanted to go for. But they're just that insanely stupid I guess and thought this would make sense.