Can she get through a locked door? Or maybe get a stronger door or something leading to the basement...sounds like she may have to go back to square one in training if she's able to break through a door! Tie her to your hip, or have her leashed with you when you're home...crate her when you're not. If she's able to squeeze through an inch (no offense, but that's almost unbelievable!), she may need to be leashed all the time until she stops with the behavior. Or if that's not an option, for the safety of the small animals, maybe rehoming them? Bleh, I don't like suggesting that, but, it doesn't sound like Happy is controllable inside with the small animals there, she'll end up killing them. That's a crappy situation, I'm sorry that you're faced with it.