Hello and welcome to the forum. I'm sorry to hear about your kitten's broken leg. What happened? Perhaps your experience might save someone else from the same type of accident.
A broken wrist on a human isn't at all the same as a broken leg on a cat.
Please take your cat in for her follow up vet visit. Why would it cost $200? Most vets charge minimal fee for a follow up on the same injury, if they charge anything.
Even if it did cost $200, better to know now if she is healing properly than to wait until there is so much damage it will cost thousands to fix.