Once he gets a lawyer, the lawyer will be able to do all of the things that you are talking about. I know it is frustrating for your daughter to be in this situation and not be able to do much. But if he can't afford a lawyer and he hasn't gotten one yet, the court
will appoint him one. First, he doesn't have to wait until trial
to have his bond reduced. His lawyer can file a petition for a bail review to have the court possibly reduce his bail. If they wait until trial, that defeats the purpose of even having his bail reviewed. In terms of any recordings or other evidence, his attorney will file what is called a discovery request, which basically asks the prosecution to turn over copies of all the evidence involved. If there are recordings, they will be required to give them to the defense.
In addition, the lawyer can try to ensure that he gets medical treatment in the jail for his injuries if required.
I completely understand that she wants to try to help him by doing something but unfortunately, a lawyer is his best chance right now. She is not able to legally file these discovery requests or petition for bail review because only lawyers or the defendant himself can file them. Anyone else can get in trouble for unauthorized practice of law. Once he gets a lawyer, she will likely need to speak with the attorney as a witness to what happened and may be able to help that way. But for now, she is limited in what she can do for him, unfortunately.