A wrongful death lawsuit does not require the participation of all potential claimants.
You have no right to file a separate lawsuit, but you do have the right to hire your own attorney for the case.
Your own attorney could assist the others, and you, in better evaluating the evidence, so that the right arguments are made
Here is the response:
There are many good lawyers in Arizona willing to help people like you.
Most lawyers are wiling to consult on your case for free.
There are time deadlines for pursuing claims, and without more information, I cannot give you any specifics
Please feel free to call me if you want. 602-494-4800
The statute of limitations in AZ is 2 years, so it is not too late.
It sounds like your daughter tried to do the right thing for her friend. Admirable, but it backfired.
She needs an attorney immediately. Do to wait on this.
Hopefully, the attorney who is representing you has the experience to advise you on these issues. However, if the adverse had no insurance at the time of the collision, there is likely no means to pay your loss.