You would need to speak to a personal injury lawyer. Most offer a free consultation. Please look on the Avvo site for a lawyer in your area.
I hope your wife has a full and complete recovery.
You probably need a personal injury attorney with experience handling auto accidents. The main issue for you is probably whether your auto insurance covers some of this.
Your insurance company will usually hire someone to deal with damage caused by the wreck. If you are trying to get your wife out from the medical hold, find a local Family Law or Dependency Lawyer to handle that portion.
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Seek legal help immediately. There are not enough details here to respond. Hopefully your vehicle had full insurance coverage and an attorney can advise you whether the insurance company is liable for the medical bills.
A personal injury lawyer in your area would be best. There could be numerous issues regarding liability relating to the car (possible defect), the tree (if it is on public property), the roadway (sharp turn etc.) All of these details should be evaluated and an attorney could deal with your insurer regarding coverage etc.
Best of luck.
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