I dont know how writing a solid script will help her in film school. This school sounds more technical then it does for developing ideas. If she wanted to write, she'd probably take a Creative Writing class.
The only tip I can give you is not to listen to people who havn't attended this perticular school, because they might be giving you wrong, and or bad advices. Secondly, read up on the program, if THEY say prepare stuff, then do so, or else just wait for the session to start and enjoy learning. Most probably they will be teaching you all this stuff you want to know.
Just be happy to know you got in for now, that is a good thing