My girlfriend has had problems with the right side of her body it gets swollen... Her  right hand gets swollen and her right foot... Why?

Consult your doc. I recommend into seeing a doctor to address the persistent cause of swelling.
See a Dr. These symptoms are non speific. Need to know the previous history, medications, surgeries, family history, social history. Is her right side paralyzed? Bottom line needs to see the dr.