Thanks for your response!! I don't know how I missed it for so long!
As of the end of the year they were doing extremely well!! Their counselor was even considering releasing them from the school's mental health program, but decided against it. She was worried about them regressing when they no longer have me as their teacher. I became "home base" for them both and they absolutely blossomed the last few months of school. They practically adopted me into their family.

In the meantime, on the advice of their counselor, I've started the process of becoming a school counselor!