In this situation I would treat her like a puppy until she develops more confidence. Give her some time and positive reinforcement. Leash her to your body around the house so she gets used to following you, and learns that you're the boss. This may take awhile but will bond you. When you're trying to get her to potty, squeeze her belly gently to encourage peeing/bowel movements. When Poppy was a pup we would have to stand and coax her at least 20 mins each potty break. Pretty annoying in Canadian winters, but at 5 months she finally understood "go pee" and goes on command.
The pinch collar may add to her already negative association with the outdoors. Have you tried a martingale collar? It tightens and the links make a clicking sound that is usually enough to get their attention. Have you tried walking her w/ another dog? This may bring some curiosity outta her and encourage her to move forward. Just some ideas to consider before a pinch collar and strict crate time. If in a month you still have no progress, then yes I would look into more regimented training. But for now a soft touch might be enough.