Everyone here has had great things to say... Good advice
I would be honest with her (like many here have said) sit her down and let her know that no one can gaurentee her a bid and that she will need to go through the process just like everyone else. Let her know she has just as much a chance of getting in as she does not getting in... In other words, she should go through the process, be open to every house and see what happens.
Just be up front tell her this is the way the process works, that it is nothing personal, but that every girl who goes through this just has to wait and see.
If after that she doesn't get it, well then if your house feels she isn't a good fit, then she'll be cut and it will all be done honestly.
And who ever said to document all of this, I TOTALLY agree!!!! Document everything, as detailed as you can (dates, people there, etc.) It is sad to say, but sometimes people will try to sabatoge things because they didn't get their way. Good luck and let us know what happens!!!!!