Yes, she did just copy and paste names to make the list. It is all about public perception. "Look - we ban 157 guns, but gun owners still have over 2,200 to choose from!" She wants to give the uninformed public the impression that the ban only affects a few "bad" guns on the fringe.
No, she is removing ambiguity from the law. If she doesn't clearly define what it is she is banning and not banning, the law is worthless. It's actually a well written law that boils down to:
No more ARs, AKs or semi-auto machine pistols
No more high-cap mags
Background checks for private sale of Assault Weapons