stupid syncing problem

my wife has an ipad 2

for a class project, my daughter made a video on a mac, using imovie.

my wife wants it on her ipad.

she already has about 7 tv shows on the ipad, which she purchased from the itunes store, uisng her ipad.

when i attempt to sync the videos on the mac, i get a warning saying something like..." are you sure you want t o sync the videos, all videos and tv shows on the ipad will be erased, and replaced with the videos in the library"

of course, that's only the video my daughter made.

isn't it supposed to give me an option of copying all the purchased tv shows to the computer, so that i can put them back during the sync?

what do i do?