Take her out with the other dog every half hour until she starts going to the bathroom outside again. Do not give her free reign of the house until she is going outside consistently. Keep her in a small crate or supervised (ie. on your lap) and continue to take her out every half hour. She will get the idea again. My two tend to do all of their business outside in the same area. Take her to one chosen part of your yard consistently with the other dog to create that area. She is still young and just doesn't have the idea consistently yet. Remember even with a doggy door, there are bobcats, coyotes, hawks, eagles etc. that could be a danger to her. I have two tiny maltese and I never let them out alone even in a CYV.
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