"actually she did die the voltigrunts are doing their best to revive her. SPOILER well kind of: Alyx does die when shee valls but the voltigrunts try to revive here so you wont play with her in episode to then she later gets revived in episode 3. Also the project DR. Judith Mossman has been working on is a device that will destroy the combine it is sort of like a bomb thing. In episode 3 you will have to plant the bomb in the COMBINE WORLD! P.S steam told this to us"