Gateway is the Medicaid program in PA. Medicaid doesn't have the best of the best as you can imagine, because it doesn't pay very much. I actually accept Medicaid in my county because I like working with people who can't afford my services regularly. But I can't afford to have too many Medicaid clients. So I understand.
That's why you need to contact the top people. See if you can get them interested. I know that here in CO the Children's Hospital people in Denver might get interested; or the CU profs working with children's disorders. Even if they're a long drive away, you're really talking about having them supervise or consult with your current therapist. So it might be once a month there.
Here is the web address for Psychology Today's therapist directory. You can sort by zip codes and when you see someone who seems like they might be helpful (they show you a photo of the therapist!) look at the listing and see if they list working with children and accepting Gateway. I don't know if there are any, but it's a resource. Interview the therapist and make sure he/she shares your values and you each feel confident in him or her or if they maybe know someone who might be very experienced in child abuse cases.
You know, the DA's office would be a resource. It might be too scary, but if not...
I know a lawyer in my local DA's office who handles the child abuse cases. She's terrific. I bet she knows all the top psychologist here. I wonder if it would be the same in your area.
I'm just trying to think out of the box because Gateway is very much "the box" and your daughter needs more than standard treatment.
Okay, stay in touch and all the best,