I can't make a new console home.

Да интернет у меня по проводу. Все службы работают

Would recommend a power cycle and try again.

However, if you've changed more than 5 times in the last 12 months you will not be able to assign again.

Have you followed all the steps here:
https://support.xbox.com/en-US/games/game-setup/my-home-xbox

Have you changed your home XBox 5 times in year?

Are you definitely signed it when doing it?

Is your XBox showing up correctly in your Microsoft account:
https://account.microsoft.com/devices/

Have you successfully setup Wi-fi or wired connection?

Change the password on the account and make sure the new one is set as your Home console.

That way she can't use the account anymore and can't play any of the downloaded games on the console.