She's coped with a considerable amount considering she was a child star and is probably ill. She hasn't looked like she's wanted to be there the past few years and yet she's still trucking on.
I say her inclusion is warranted.
It seems you're on your own with this one. How on earth does someone who has been little more than a pop puppet most of her life belong anywhere near the company on this thread.
Even the reasons you've listed above prove that she really isn't a strong woman with talent. if she was a strong woman, she wouldn't be where she is today and I would also argue that she qualifies as talented.