Hmm, I guess that if she'll give them a key word and they're left clueless, they would only be so if she didn't come along. Otherwise if she lived, she could explain what the key word is. But if you want her to come along, then maybe they can find the key word somewhere in an empty office of someone other than hers? Maybe someone higher in rank and have it be something restricted she had no permission to, leaving her clueless too.

And yeah, Freya and Matt will get to escape, but the scientist not if she's caught, she'll provably will be shot on sight or anything.