The ER doc called us last night, she said that the radiologist had taken a closer look at the x-ray and did see something - a "buckling consistent with acute fracture" - but it's very slight - so basically, her arm is a little bit broken. We went to the pediatrician this morning, she said because she doesn't seem to be in pain and she is using the arm, just very tentatively, that they won't do anything about it. She called the orthopedic doc and they agreed - no need for splinting or casting. She wants us to just keep an eye on her and make an appointment with the orthopedic doc next week for them to have a look and maybe take another x-ray. And definitely to call asap if she falls on it again. So bad news that she does have a little break, but good news that at least we now have an answer.
So now my husband is walking around kicking himself because "I broke my daughter's arm" (his words).