Sister should be okay, it just may take some time. I imagine the fact she's athletic will help in her recovery.
In a measure of public service, I'm sharing five signs of a stroke, thanks to the American Stroke Association's Give Me 5 for Stroke campaign:
- Walk — Is balance off?
- Talk — Is speech slurred or face droopy?
- Reach — Is one side weak or numb?
- See — Is vision all or partly lost?
- Feel — Is headache severe?