It isn't uncommon for dogs to get a little digestive bacterial infection, especially if they eat stuff outside. I usually do some at home work, before I take them into the vet for diarreha…but if you are unsure how serious it is, definitely get her to a vet.
But I usually fast the dog completely for 24 hrs. water only. Then if the diarreha clears itself up in that time I do half ration for the first day, and then work my way up to full ration. If it last more than 48 hours and/or they have other symptoms of being sick (lethargy, fever, etc) off to the vet we go.
The problem with doing a "bland" diet is that it still requires the intestines to work, and exacerbates the problem if they are already irritated from the bug...and even a bland diet is *different from what they are used to...so it can cause additional digestive upset. So fasting just gives the system a rest.
My guess would be that she picked up a bug from the (was it raw?) bone...if it was raw, they should only be left available to the dog for, at most a few hours. Otherwise could be lots of other places...our dogs usually find standing water in the yard, and drink it no matter how old it is GROSS! So that is where they get some bugs.