With SM not talking to the police, I could understand if she was upset at them taking the 4 y/o and not wanting to talk at first, when WM's story was that Sherin had just disappeared. However, after hearing that your husband, at the very least, let your other child die, I would think with the help of her attorney and with 2+ weeks of time to think about things, she(IMO) should understand now that removing the 4 y/o was for the 4 y/o's safety and that she and/or her attorney would be making plans to now speak with the police about the night Sherin died.
I just can't see the attorney thinking it was good idea to reiterate that she isn't going to be speaking with/cooperating with the police if she's told the attorney that she really was sleeping and knows absolutely nothing about what happened. I would think in that case he would have said something along the lines of "my client is grieving at the moment, however we are making plans to meet with LE and give them an official statement". The whole "my client is not speaking with the police" statements baffle me. Especially when they should be doing everything possible to ensure that the judge over the custody case with the 4 y/o feels its safe for her to return to her mother.