downgrade Admin to "Managed with parental controls" - no data loss?

hi k,

yes you can down grade her account and enable parental controls. This will not delete her content such as itunes, photos, documents, extra.

if you haven't done so already, make another administrator account with you will use to manage the computer. Make sure the account has a password; and that password is not the same as her password.
then Login with the new administrator account.

go to system preferences and click on accounts. unlock accounts by clicking on the lock. click on the old administrator account. now uncheck allow this user to administrate this computer. then check enable parental controls. then click on the open parental controls button.

you can now configure parental controls.