The earth is being invaded, but the Doctor is sick and getting worse; there’s nothing he can do to help them. They’re on their own and they’re completely helpless.
Rose wishes she knew what to do; she’s helped the Doctor take on the worst that the universe can throw at them. He always comes up with a plan and it always works, but without him she’s worse than useless. All she can think to do is to run and hide in the only safe place there is. The TARDIS.
She prays that the Doctor will wake up and save them.