The thing that struck me fraudulent about Gandhari is that she hated Karna and wished for his death, but when she learnt from Krishna that he was Kunti's son, she suddenly was saddened about his death and went on w/ her tirade.
If she hated Karna b'cos of his influence on Duryodhan and wanted him killed by Arjun, why would it make a difference that he was born to Kunti?