Why does everyone go on about Karren getting a helping hand in her career? Just take a look at the acting profession its full of nepotism. She's not the only one in the country who might have used some connections to get ahead, it happens in all walks of life.
The fact remains that whether she lied about her qualifications or used influence to get in she would not have done so well if she wasn't competent. If she had proved to be useless she would have become so successful and would not be where she is today.