To make the training process as fast and positive as possible, I would crate whenever I'm not 100% focused on the dog. Everytime the dog relieves itself inside is a missed opportunity; anytime she goes inside without being redirected adds to the confusion of the training.
Once she has learned to hold it in the crate, she can graduate into a space (like a kitchen). She's only ready for the kitchen when she can stay there without leaving something for you and the hubby to clean up!
Cedar (tri), Willow (blen), & Holly (ruby)