Your right...as long as she is staying 3+ nights theres no outside vendor fee. Regarding cost of travel...will you be booking her flights/room, or will she book it and charge you for it? The "traveling costs" can get you if you dont know how much itll be in advance.
$1000 is a great price...especially if you like her style and own the rights. At my vegas wedding, they tried to charge me $900 for the rights to my photos (and it was only 45 minutes of photography...50 photos!). Needless to say, i did NOT purchase the rights to them.
Do you have more details of everything included with the package? Sounds like a great deal!
Also, maybe check with others getting married before or after you in case they want to share travelling costs