I haven't gotten to prosecution nor do I expect that to happen for us but I would follow the DAs advice and focus on your family and son. That's great you've reached out I did the same to no avail but there is no need to continue reaching out if she is not responding. Perhaps some others will chime in with more particulars.

I don't know a lot about this since we only went thru several hearings, then my sons agreed to accept the offender's plea to lesser charges. But I do know that when it comes to court proceedings, the evidence and testimonies have to be deemed true, not influenced by coercion in any form from others. Also, potential witnesses who are seen as interfering in any way with others involved can be labeled as hostile witnesses and their testimony isn't weighted as heavily as others. If you are going to be a witness for your son, please be sure you are held in high esteem by both the prosecution and the defense so you are not labeled a hostile witness. The prosecutors need to know who is truly going to bolster their case and not take chances with people who may jeopardize it in any way. The defense can use your actions and words against you as well. Things can get fairly dirty in these cases, and the sides need to be clearly drawn. If your MIL comes around, it should be on her own, not thru your coercion.

Our best friends knew something about our sons' abuse and said nothing, thinking that it wasn't our business. As soon as our sons reported, the detective and the asst prosecutor instructed us to have no contact with them. They then lied about their role in the whole thing. We all went to church together, our pastor took their side and told us to leave "her" church. We did and have had nothing to do with any of them, lost our friends and our congregation. I'm sorry that you are going thru all this, especially your son, and I hope things can work out for the better at a later time, but for now until all the legal issues are resolved it's really best to follow the prosecutor's instructions.

Your desire is so normal but unfortunately, your situation is not. The DA must protect the case. It is their first priority and it is correct. Your in-laws are adversarial to the case. They can use anything you say, even the most innocent of small talk, against the case.
Please focus on your family unit until the case is done. I have been in your shoes and can completely understand why you want to have contact. I had to let my mom and several other family members go until after the court case and until I was positive they were supportive of my daughter.
My prayers to you.

It just occurred to me perhaps her husband's attorney has advised her not to talk to you??? If he has counsel that might explain it. As above said after the case maybe a better time to reach out or perhaps she will.

mommy bear said> They can use anything you say, even the most innocent of small talk, against the case. I agree, that happened to is. my innocent husband sent his only sister a desperate text message right after our eldest s son initial disclosure, saying he still could not believe/face what his father had done and that he was in shock… Guess what? Her own sister, who lied to the police (and then went back with her lies when the attorney proved she was lying), her own sister shared the text message right with the rapists defense lawyer and they are still using those 2 desperate lines from my husband to try to set the pedophile free. my husband felt so betrayed by his own family (again!) that decided to consider his parents and sister dead.

Wow that is horrible I wish I knew why people are so desperate to defend child molesters it really makes no sense whatsoever.