I think it's possible that the airheaded mean girl act was meant to be ICly an act? There were some vague indications that might have been meant to signal that. (Vg gheaf bhg gung gur jubyr YRG'F PBZCRGR GB FRR JUB UNQ VG UNEQRFG jnf va snpg VPyl n snxr pbzcrgvgvba gb vyyhfgengr ubj evqvphybhf vg vf gb znxr crbcyr va trareny naq jbzra va fcrpvsvp (naq Urael IVVV'f jvirf va rkgen-fcrpvsvp) pbzcrgr sbe Jubfr Genhzn Vf Gur Jbefg, Yrg'f Oner Nyy Bhe Cnva Fb Lbh Pna Qrpvqr.) Anne Boleyn was one of the first wives, thus one of the first to sing, thus spent a LOT of time on her one-note Mean Girl sniping while we progressed through other wives' songs, and it's possible the whole sniping thing was a deliberate persona she just got really into.

But... like... if that's what they were going for, they REALLY needed to make it more unambiguously clear that that was the case, and generally subvert it more. Not to mention, yeah, the way political ambition and political maneuvering were sanded away from all of them in the interests of POP STAR GIRL POWER and catchy songs. (But the songs were super fun and catchy!)