Should I call the social worker (details inside)?

Someone reported my step-daughter to child protective services for child abuse and neglect. They have interviewed her children, done a home visit and are currently conducting an investigation. The social worker took my husband’s contact information and he has spoken to her. She did not take my contact information, but although she doesn’t live with us now, my step-daughter and her kids lived with me for at least three years. She is not a perfect parent (who is?), but she tries hard and none of her mistakes rise to level of abuse or neglect. She loves her children and takes good care of them. The investigation has been going on for about a month now; the worker contacted her estranged boyfriend and has told her she has found leads she wants to follow up on. My question is, should I contact the person conducting the investigation to share what I know of her parenting or does that run the risk of alienating her or causing her to become more suspicious and making it worse for my step-daughter? This is has potential to be a big, life changing issue for her, along with the fear of losing her kids, she is going to school to be a teacher and any result other than unfounded will make it impossible for her to get a job. Any advice would be greatly appreciated.