I have been told my sister in law has 400,000 of these shares...

I have been told my sister in law has 400,000 of these shares after my brother died last year. She has asked me what should she do. At this stage going by what is being said here it would be good money after bad if she gave them more money. I haven't seen the information CCC sent to shareholders but I have a quick question for someone who knows: What happens to her shares if she doesn't give them another $18,000 for this offer?'