I hope she gets better soon. If they let you in to see her, talk to her, read to her, sing to her, anything you can think of to let her know people are pulling for her. Plus, from what I understand, brain trauma tends to get worse before it gets better. Like say day 2 after an accident is worse than day one becaue there's more swelling etc. Then slowly things get better.
I hope your friend gets better soon, I'm pulling for her!!!