About 2 and half years ago my sister was involved in a car accident which caused trauma to the head and she temporarily went insane. She went for treatment for about six months, taking medication and after she completed her treatment she was fully recovered, back to normal and returned to work. Recently she has no been herself, saying things that do not make sense and not able to sit in one place and compose her sentences properly. Is it possible she could have relapsed? She works very hard, stresses too much, does not at or sleep well. Could that also contribute to her recent behavior?