2 Factor Authentication code

You can’t disable it, unless you enabled it less than two weeks ago.

See this support guide:

Two-factor authentication for Apple ID - Apple Support

at section “Can I turn off two-factor authentication after I’ve turned it on?”

Regards

Giulio

Can I turn off two-factor authentication after I’ve turned it on?

If you already use two-factor authentication, you can no longer turn it off. Certain features in the latest versions of iOS and macOS require this extra level of security, which is designed to protect your information. If you recently updated your account, you can unenroll for two weeks. Just open your enrollment confirmation email and click the link to return to your previous security settings. Keep in mind, this makes your account less secure and means that you can't use features that require higher security.

Two-factor authentication for Apple ID - Apple Support

You can't. Once enabled on your Apple ID, it cannot be disabled. This will be effective on any Apple device that you (or someone else) has logged in with your Apple ID.

Is your daughter under 13? If so, did you establish her own Apple ID or is she using yours?

Ref: Family Sharing and Apple ID for your child - Apple Support