I tried this level 3 times before I looked it up. After reading a bunch of posts from varying sources, I strategized by combining the advice of a few different posts and had this done in 3 more attempts!

First, make sure to check Momo’s Tips (only available in Maiden difficulty) in your game and wear exactly what Momo tells you. I have highlighted the button with a red arrow pointing to it in my screenshots. Be sure to scroll down to view EVERY item that Momo has listed. I think this may actually change based on individual gameplay, so don’t just copy my list, view your own to make absolutely sure you’ve got it right. (This is a helpful tip if you’re struggling with any level in the game, btw.)

Secondly, upgrade your skills!! As somebody mentioned, it’s about the DIFFERENCE in scores, not your personal score. The skills I used are: Smile Lv.5, Picky Immune Lv.6, Critical Eye Lv.3, Charming Lv.4. Get higher if you can afford it. My Picky Immune is so high because the opponents vary in timing when they use Critical Eye against you. The same opponent appears to use the same skills in the same order during a battle, so you don’t need to have Picky Immune as high if you time it right.

Finally, someone posted in a Reddit thread that in the case of this level, ‘less is more’. I took that into consideration and only added a couple of accessories to Momo’s choices.

Hope this post is helpful for everyone to defeat that awfully mean looking bunny lady. Good luck!