do I need a lawyer for a car accident

Likely you will need legal assistance. Once your daughter has completed treatment, a documented settlement proposal needs to be prepared and sent to the insurance company.  At that point -- hopefully -- the calim can be resolved.  Your daughter has 2 years from her 18th birthday to settle her claim; however, you have 2 years from the accident date to settle any claims for medical bills you paid or property damage to your car. If you health insurer or vehicle medical payments coverage paid any bills, they are likely entitled to get some or all of the moneythey paid reimbursed from the settlement. We can assist with your efforts.

 First off, tell your daughter to have no contact whatsoever with the person that hit her. Then, make sure your own insurance company has all of the pertinent information. Don't even talk to the other driver's insurance carrier until after your daughter's treatment is complete and she  is on the road to recovery.  Even then be very careful what you say to them regarding her condition. To be safe, it is best to contact a personal injury attorney in your area who specializes in auto cases. A good attorney can actually increase your recovery even taking into consideration his/her fees.