Still getting used to animating things. I'll try being more specific next time.

pretty awkward and robotic, since her arm just pivots on a point and none of the muscles of the torso seem to be involved in the movement.

No need to be a hard thing, try make just one more frame after and before the middle frame.

I prob could have. I'm still having trouble with animating.

You could add more frames to make a movement more smooth