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Hello. Thanks for the question.
The hair thinning is not likely to be due to the concrete her crate was on. It's more likely to be due to allergies, fleas or mites.
I would start a monthly flea preventative no matter what to make sure it's not a flea allergy. Revolution, Advantage, Frontline and Comfortis are all options for flea prevention.
I would also scrape the area and check it out under a microscope to rule out mites. Mites are treated with insecticides to resolve the infestation.
If all that is done and normal, then I would get a dermatology consult with a vet who is progressive in derm or a veterinary dermatologist. They would do allergy testing and food trials to get this under control.
I hope this helps, let me know if you have any other qeustions.
Yes, if she also has GI signs, then allergies become the most likely.
Here is a nice write up on food allergies and allergy trials in dogs: