she cheated by telling her family to give her a code if the press coverage in the outside world was bad...her code was that her family should contact the programme and tell her that her sister was ill, so they did and she stupidly told all the housemates forgetting she was being watched 24/7!!! so they booted her out!
BB was peed off with her so they told her she was getting 'Ejected' from the BB house rather than she choosing to leave - becasue thats what everyone was doing!
if she had been using CODE i reckon they wouldve given her a warning, i mean Imogens broken the rules of the house a trillion times and she's just unable to nominate.