I'm no legal beagle, but were this me, I think I'd handle this in two parts.
Part A) Collect on her insurance for the damage to your vehicles and out of pocket expenses. Complete Part A before moving on to Part B. (note, do not sign any paperwork which releases her personally from additional legal claims resulting form this accident. Sign off on her insurance only)
Part B) Hire an attorney and file a civil suit citing her wanton disregard for your lives, ongoing issues involving injuries recieved as a result of the accident etc etc etc, Any competent Pesonal Injury Lawyer will know all the right verbiage to use in the wording of the suit. Now, the reason I suggested signing off on the insurance company in Part A was to cut her off at the knees from having big money representing her in court. With her insurance company off the hook, she's on her own dollar. That gives you a tremendous amount of leverage in dealing with her. Unless she's wealthy (doubtful some rich lady would be driving an old 18 passenger van) you need to watch out that she doesn't simply have herself declared judgement proof. This is where she shows the court she has no money and there's no hope of your suit prevailing in terms of monetary settlement. At that point all you can get is a lien against her that she'd have to pay off before she could do anything other than eat, sleep and work. It gets pretty complicated but as I said, a competent personal injury lawyer can explain it to you.
So sorry to read of this, it's everybody who rides worst nightmare. Good luck and hope everyone is fine now
B B