Only the district attorney's office can tell you whether there is a case or not. Even if they can't get them for statutory rape they can be charged with forcible rape as there is no age limit for that. You can see the statute on that in the link here
I would suggest you contact the DA and not rely on CYS, they are not law enforcement.
In addition you would have a separate case for the mental and physical injuries sustained by your child. This is a separate lawsuit against the parent's of these girls. So even if the DA is not wanting to handle the case, you can file a separate lawsuit for the mental and physical abuse
sustained by these two horrible kids.
Please Note: JustAnswer.com is a public forum. JustAnswer.com is not a law firm. JustAnswer.com is only a question and answer site. Asking a question does not create an attorney-client relationship nor is your question protected under the attorney-client privilege. An attorney-client relationship is established when you enter into written contract for representation and pay a retainer directly with the attorney or attorney’s firm.
JustAnswer.com uses the term “Expert”. I do not hold myself as an expert when I answer your questions. The information given by me is not legal advice. I am not establishing an attorney-client relationship with you. I am providing only research, resources and information only for you to be informed and educated about your particular needs and my answer is limited to the facts presented. You are only paying me for such information given.
My answer or reply is limited to your facts presented and additional information you post may not come in after my reply or answer has posted, if this has occurred please let me know and I will answer further. Due to site tech reasons, oftentimes I am initially only able to see the first part of your post, so this may result in more interactions between us. There might also be a delay in my reply or answers, as I may be helping other customers, or called away from my office or have logged off. Please be assured your question(s) will be answered promptly.