Unfortunately, it appears that your mother is a constant victim and will continue to lose money to scammers for as long as she has money to send (and more if she can beg, steal or borrow money).
If the bank account that she drew the money from is in joint names then I'm afraid that you will be jointly liable for the money and the bank will come after you for it as well as her. There is also the worry that the bank may decide to involve law enforcement, particularly as your mother seems to have been made well aware that she was dealing with a scam, yet carried on regardless. It is hard to say, but if I was you, I would seriously consider cutting all financial links with your mother and removing your name from the bank account. It is too late now for the $10,000 but it could save you a lot of trouble in the future.
For more information about check scams, you can look at this thread here viewtopic.php?f=9&t=3237
Finally, I wouldn't worry about the scammers coming after you or your mother. Firstly, they are likely to be based in somewhere like Africa, secondly there is nothing in it for them to do so - they are just after money (which they have got from her).
I am an experienced Scam Baiter and any mails you see between me and scammers uses untraceable email accounts. Please do not get into correspondence with these criminals using your real life details.