I was hoping for better news this morning
I'm glad she is back at the vets, she really should be observed. An xray is only going to pick up a skull fracture. She would need a CT or MRI to pick up evidence of any bleeding inside her brain. Hopefully, this is just a mild concussion. Unfortunately, a head injury can cause vomiting and lack of appetite which in turn causes hypoglycemia and dehydration which can make neurological symptoms even more pronounced and make it hard to tell the severity of the head injury it's self.
Please keep us up to date on how she's doing.