Re: I have this friend....
I agree with you and the others, I would say she
is not getting enough human contact time/exercize.
Obedience is a good idea, too.
Get the teenage boys to keep her busy with play,
walks, and training etc. and get her tired out. : )
Don't rule out a medical problem either.
If everyone's suggestions do not pan out,
may I suggest to your friend to take her to
a vet for a check up.
When I was growing up our family had a GSD that was quite an escape artist.
She even chewed/clawed through a solid wood gate to get out.
We found out later she had a brain tumor and her
escape behavor was because of the pain. :(