I think that leaving her in the bathroom is a much better idea than crating, but you should still get someone to come and play with her mid day. It's such a long time for a puppy to be alone. What would be even better is if you know someone that could take her on some days. I was on a reading break from school when we brought Odie home. Afterwards, on days when I had school and my husband was at work, my Mom would pick her up from our place and take her to work with her (in a closed office). There would be times that my Mom would have to leave her alone for an hour, but it was better than her staying home alone which I wouldn't have been comfortable with.
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