Damsel in a Dress: Milly's Great Escape

On several occassions now, Milly has broken out of her crate while we are gone. I think it usually stems from her being angry that she is in her crate in the first place because she thinks that we just put her in there and we are not leaving (aka when someone takes FOREVER to get out the door). She basically bangs on the door with her paw until she knocks the gate off of its not so sturdy hinges.

I don't think she has actually ever done any damage on these occassions, which leads me to believe we could actually leave her out in the house while we are gone as long as the house is clean. I have tried leaving her out in the bedroom before (where her crate is), but she kind of freaks out and scratches at the door. I'm sure she'd calm down and get used to it, but the door may not appreciate this process. She actually really likes her crate, and often goes in there on her own accord to take naps etc. We might test the waters with letting her roam free though.

Here she is cackling about how she outsmarted us: