Two Visits in a year

If you going to visit a destination for vacation on February soon. Then would you still arrange another vacation to the same destination just few months later? Well, it is consider ok if you already visited that place but want to go there again few months later. However, now my friend who going to visit B on February 2010 already bought ticket to the same location at September 2010. Does she sound a bit silly? How does she know she would like the place even not yet visit before?