Do you have your own garden? Maybe if you just dog proof it, high fence or whatever so she can't escape and have a dog flap in the door. If she is a small breed, a catflap will do. We have catflaps for the cats and they are lockable both ways for when we don't want them going out and also to stop them coming into the house from the porch at night. There is one on the inner door and one on the outer door. Dogs learn how to use them even more readily than cats. That way, she can take herself out and you don't have to stand about waiting.