I've never heard anything about swelling only being on one side. Not a sound way to create a diagnosis AT ALL. I think her constellation of symptoms are worrisome, and warrant at the very least ruling out pre-eclampsia. Has her blood pressure been taken or any urine dips at the office (pretty standard appt check)?
Here is the diagnostic criteria for pre-eclampsia: http://www.preeclampsia.org/health-info ... d-symptoms
Are you able to take her blood pressure today? Often drug stores have them...
Please keep posted... and since it's Sunday, and I'm sure hard to get a hold of your doctor, don't hesitate to do a check at the hospital to ease your concerns and give you clearer answers to what may be going on.