Looking for some possible help.

Hoping there’s something Lala can do for me. I have 4 children (20,18,14,5) My 5yo regressed to basically nothing two months before she turned 2. She was potty trained at 15 months. She’s used to speak to us.. amongst other things. Her regression was so bad that she had to be out back on diapers. She forgot to speak, she forgot who she was. I was told that the chances of her speaking to me again were slim to none. 😑😑 I just never gave up on her!! I wanted to know if there was anything ( apart from therapy) out there that could possibly help me help her. She’s actually doing a lot better. Still kind of ( some words) non verbal. She knows a lot because I sit and teach her a lot of things that’s frowned upon with her therapies. She knows 18 presidents just by looking at images. She knows shapes like Rhombus, Parallelogram, right triangle and much more.. it took her nearly 1.5 yrs to call me mom again. I just want to know if there’s anything that would help me get who I know it’s inside of her back? Thank you in advance 🤗🤗