If the person was not aware the top was way off kilter - do you think she (?) Will notice the difference?
if the person takes suggestions well - maybe you could start by saying how attractive the top is - at first glance ,- and then. Go into a private teaching session.
At any rate - bravo for you for taking on a mess and redoing it. I've gotten cranky about trying to make those things gs right.
Would there be a graceful way of doing a presentation on what makes it easier to long arm a top.
top.lays flat opposite edges are the same length, adequate seam width - whatever makes your job easier?