Re: User not entitles to language - but repairing installs wrong language
@n4cho_SixtySix Some regions still receive a language-locked version of Sims 4. Since the game is now free to play, we're hoping that will change, but in the interim, there's nothing you can do on your end to enable English for your daughter's account. She's already received the Polish/Russian/Czech version, and your only option there is to contact EA customer support and have it removed from her account.
For your account, you should be able to switch back to English without uninstalling and reinstalling the entire game, but you'll need to install Origin, at least temporarily. You can download it from here:
Open your Origin game library, right-click on the Sims 4 icon, select Game Properties > Advanced Launch Options, select English from the dropdown menu, and let Origin repair. Then test the game.
If Origin thinks you don't own Sims 4, I would recommend NOT redeeming your free copy, as you may also receive the language-locked version, depending on where you live. Instead, uninstall the game itself and download it again from the EA App.