While you can likely lawfully do so there are reasons why you should not and should have told your attorney. Tell the attorney now.

Yes you can attempt to negotiate. Find an arguable reason why they are not due everything they claim (eg the fees are excessive) so they have...

You agreed to take back the ticket and pay and she agreed to accept payments over time? If that is the case, you are not in breach of the...

You can sue the other person for the debt.

The best you may be able to do is defend the case (there may be technical defenses you might be able to find) and then convince them you can now...

Yes you can sue. The consequential damage of losing the home might not be able to be recovered.

The original contract you signed when getting the CC likely provided their right to do so.

No and they can be in serious trouble for even making this threat.

No, being put in her bank account would not make you responsible for these other debts (except as to the extent of the money in that bank account).

You are responsible for the debt but have a lawsuit against your daughter and her husband.