Why did Myne frame Naofumi? In The Rising of the Shield Hero, Myne chose the Shield Hero as her aid and later betrayed him for some mere 800 gold coins, that were equally divided between heroes.

I did not find any reason why she did that.

Is it because Naofumi is a Shield Hero (a degraded hero)?
Make sure to see the full anime, if you have seen it till the final episode and you still can't discover why you can read my answer


   Because Myne is royalty, she didn't betray him for a mere 800 coins, but she was trying to mock of him from the beginning, it has been showed that she is the second princess to the throne, so it is basically just making fun of the degraded hero, proof : https://shield-hero.fandom.com/wiki/Malty_S_Melromarc you can find here position as queen