Im asuming that match was a once in a lifetime win simply because of those limits. Lines of vigor do have uses like warding off other chalkings, but she took advantage of a weak spot in her opponent's line of warding and some leftover slanty lines of forbiddance while he was distracted.
On the whaling away with lines of vigor thing, the opponent would have to maneuver the chalkings around his line of forbbidance. While thats happening you could send your own chalkings and whale away at a certain spot before they get there so theres less to get through.
But i think it really just depends on the strategy being used.
I may have used the wrong teems, havent read the book in a long while