AFAIK you can't override that, although I could be wrong about that.
As far as others getting your wireless key from her netbook make sure your daughters account is astandard user account and that she does not have administrator permissions. That way if she tried to see the wireless security properties for your wireless network she can't unless she enters the administrator password. In the example screen shot if I am logged in as a standard user and try to check the Show characters checkbox UAC pops up and requests my administrative user password.
http://cid-25ab668da65c8fbe.skydrive.live.com/self.aspx/Windows%20images/Showcharacters.png
In all cases make sure the administrative user accounts are password protected with a strong password and access to those is severely restricted.
FWIW I run as a standard user 99% of the time on my Windows 7 laptop. My wife runs as a standard user 100% of the time on her XP Pro desktop. When I setup my PCs I create an administrative user, ie. Root in my case, and the required number of standard users for each machine. All are password protected. Root is only used to install programs, change system stuff, security settings, etc...etc...etc...
MS-MVP Windows Desktop Experience, "When all else fails, read the instructions"