P. S. Forgot to add that buying her some foraging toys and food bowls to put in her Happy House can keep her occupied in there longer than just giving her treats and tossing in toys. Toys and food bowls, ingenuity games where the dog has to work to figure out how to get the treat/food out of the toy/device/foraging bowl can keep the dog distracted with fun foraging fo food as it used to have to do to survive as she acclimates to being in the crate with the door closed and on her own. Dogs love foraging toys/bowls/games! Love to work for their food!
Work slowly up on her times in the crate with the door occasionally shut, (I always softly yelled "Happy Time!" if my dog noticed when I closed the crate door), even when playing with a foraging toy/treat/food dispenser so she'll know she can trust you to always let her out - that going in her Happy House isn't a 4 hour sentence. Though at times, she may need crate rest where she has to spend lengthy amounts of time in her crate to recuperate or during a hospitalization, when others have to keep her for you and must leave home, so this type of positive-reinforcement training will stand her in good stead in her life to come, a happy, settled, submissive, calm dog apart from you, trained to trust you and other humans of you choose to leave her with and settle herself in whatever housing she is placed in. She'll think she's won the prize once again, if you've trained her to think that!
__________________  Jeanie and Tibbe One must do the best one can. You may get some marks for a very imperfect answer: you will certainly get none for leaving the question alone. C. S. Lewis |