When your boss is editing your slides, there is a risk that she will add the same key message on every slide. She has not fully immersed herself in your story. She does not see the full context of the presentation. Time is short, too short in fact to study the presentation in detail.
Better make sure that the point “our architecture is flexible” gets mentioned a few times in the deck. Extra bullet on page 3, a nice bubble on the side on slide 7, foot note on page 15, and bold the flexibility point on the last page.
Have the courage to stand up and stop her.