Help!! Mom had a stroke!

I hope you rehab nurses can give me some direction. Mom went to her PCP for her regular 3 mo. check for hypertension (medicated). He found her in A-Fib. EKG verification and off to the Cardiolgist. He recommends a TEE and electrocardioversion. Doesn't work so he goes the chemical route and she is in sinus until the next morning then converts back to A-Fib. BTW - she got a challenging dose of Coumadin before the procedure but did not recieve any Coumadin the night of, nor the next day following the procedure. They told us to be prepared "in case" she had to spend the night after the procedure so we had packed her "home meds." The Cardio had a "ckeck list" of meds in the chart, including Coumadin that were to be given that night. I reviewed the checklist with the RN (being one myself I am the medical "spokesperson" for the group). She said the they were not "written" orders but assured me that she would contact said doc for them. I left the floor thinking that I had all bases covered. The next morning I call my dear sister that had stayed with Mom to see how things were progressing. She tells me that Mom had no meds the night before and that none were ordered for her this morning - the nurse actually said - I'm not REALLY telling you this - but take your meds that you brought from home." I was very cranky to say the least but showed up during discharge - just wanted to get her out of there. We took her home that night and the next morning she fell to the ground with a stroke. She can no longer move her right side. No arm or leg. Was it the lack of Coumadin after the procedure? Her carotids were fine. I am just very angry at this point. I'm a peds nurse so not used to this adult thing. Especially not having to transfer my Mom (who two weeks ago could make a family dinnner) to the potty. I am hoping for progress but I am totally out of my element and still angry that if maybe she would have had the meds LIKE THE DOCTOR WROTE we could have avoided this outcome/ Plus - I am clueless to rehab.....how can I make my Mom better?