I'm irritated because making statues of Marisa and Sanae is a really obvious slight at Reimu, and while Sakuya finds Sanae to be amusing and a decent enough person, Reimu is a dear friend, one with whom Sakuya is closer than just about everyone else outside the SDM.
If it was just a statue of Sanae without one of Marisa, then that would be fine, Kanako's gonna do what she's gonna do. But there's literally zero reason to officially honor Marisa and not Reimu unless you're bitter that she was always the better hero of the two shrine maidens.