Ugh - I’m sorry. I can’t help but suspect that her carping about household expenses is because she’s been saving up money for her future single life and those pesky utility bills are slowing her down!
I’m glad you both have good incomes, you ought to be able to get 50:50 custody. I’m truly sorry divorce may interfere with your therapy for your child, that’s certainly the worst part of this.
Just to tell you an inspiring story I know: a friend of my best friend has a non-verbal autistic son. He used to do a lot of self-harming. Then, in his early teens, his doctor put him on sulphoraphane (broccoli extract, in this case specifically from a company called Thorne). His self-harming stopped. A couple of years later he started learning to communicate with an assistive device. Turns out he has an amazing vocabulary for someone who could never speak! Then Covid made it necessary for his father to be more involved in his schooling, as it was remote. He blossomed, started writing amazing poetry, and composing symphonies in his head. Now he’s working with a professional musician friend of his fathers to translate what he hears in his head into symphonies. I can’t wait for the first one to be performed!