My mom got into car accident and her insurance broker had her contact a lawyer

Hi I just need some help. My mom got rear ended in arizona where we live. She called her insurance broker company to help her contact her insurance and they told her to call some random lady to answer questions. She apparently called her and she said to call this law group from California and this chiropractor which she did. She then signed a contract with the california law group. She has a hard time getting ahold of them but the chiropractor can contact them easily. The lawyers are the ones scheduling her doctors appointments and haven't let her pick her own doctors but now that she needs to go to a neurologist they won't schedule it and its very important as she may have a brain injury. We called the insurance broker already and they had no answers and when we questioned then they hung up on us and are ducking our calls. The random person that's handling the in-between says she's a private third party and I think the name she gave us is a fake name. What can we do?