Right!!! YOU are the only one here allowed to do that!!
OK - fine. See my last.
I am not dictating she needs to do anything, her life is dictating that.
I'm simply telling her that euthanizing him isn't the worst outcome, or anything she should feel guilty about, if she can't find a really good outcome she knows is the right match.
Can you guarantee this dog will be safe, and everyone around the dog will be safe, for the rest of his life if she gives it away to someone else? You can't.
There is only one way to guarantee that, and that is to do it yourself.