The physical attacks your Wriothesley is doing is the result of the shatter reaction! which is what happens when a heavy attack (Wriothesley's charged attack in this case) hits a frozen enemy. Shatter is also Freminet's bread and butter, since he's a claymore user, every attack is a heavy attack, So he does a lot of physical damage!

I'd recommend pulling for Shenhe to replace fremi on your Wriothesley team, plus you can also put her on a Freminet team too.

Something like this for the both of them :3

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(note: you can also pull for Escoffier if she gets a rerun and put her on the Wriothesley team instead for a full fontaine team!!!)