If you modify "Trials of Mana\Content\Game00\BP\Player\pc01_01\pc01_01.uasset" and change "pc03_01a_WeaponStorage_socket" to "pc06_01a_WeaponStorage_socket", it'll be across her back, which is better. Still though, it's the wrong way around, meaning the end of the flail points inwards, instead of outwards, so it clips through her shoulder.
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This one isn't so bad: https://imgur.com/WyN6qZ2
But this one is pretty bad: https://imgur.com/J2aqVzU
Alternatively, I think that if you were to shrink down this model down to Charlotte's size, it could fix a lot of issues.
I can only think of hiding the weapon so small that it cannot be seen.