This could all be fixed if it’s revealed she had a bit of training as a toddler by some forgotten survivor of the Jedi purge. 😉
I suspect there’s something waiting for us in IX to explain it, but who knows. Either way, taking three films to explain the protagonist’s origins have left her with a fairly shallow arc in each film. I blame Abrams’s penchant for mystery boxes and cliffhangers and inability to tell a complete story from start to finish.