I guess there's plenty of blame to go around, including Guthrie, but it seems like informing the coach that she wasn't going to be renewed was a better option than leaving her hanging.
College sports is a cruel world. Win and you stay or move on to a more prestigious job or lose and go home. That's the cold hard reality of that world. I feel bad for Coach Jackson and wish her well. With any luck, maybe she'll get a chance someday to prove UA wrong.