This bug happens because you shouldn't have Marie in the party during the bunny girl scene. You somehow managed to hire her very early (Too early).  I've replayed my project so many times I've lost the count and whenever I retry it. I don't see how others found a way to hire her this early (Like you did). It's as if you activated a switch to hire her way too early that shouldn't be activated during the bunny girl scene and you're stuck because she  should not be in the party at this moment. She should be hired after you talk to the Queen the 2nd time just after the bunny scene, after you go back home, then after you should head to Azala Town to hire her, but I'll try to fix this with new  switches conditions in future release.