Though Margaery was working hard to convince the High Sparrow and Septa Unella that she had dedicated her life to the gods, the viewers at home knew better. Not only did her new crown hint at her family's importance (there are roses intertwined with the antlers), but the drawing she slipped to Olenna is concrete evidence. This may have seemed straightforward to some people watching, but not all the fans know that the rose is House Tyrell's sigil.

Margaery was letting Olenna know that she had not forsaken her house name and pride. The Tyrell motto is "growing strong," and their banner features a single yellow rose on a green background. Margaery wants her grandmother to leave for her safety — not because Margaery no longer wants her around.