hi veen...so sorry to read abt your little kitten, it takes time the progress is slow as long as kitty is able to eat and drink even if it takes some assistance for a while I wouldn't give up hope just yet. she could well be crying b/c of the huge confusing sights and sounds now going on around her, with a brain injury everything will seem real strange for awhile, is she able to see or do you think she maybe blind?
have you made some adjustments to her living space so she can find her food and litter easily? have all that close by
....give her a few more days and watch closely for even the slightest gain each day..that gives you hope, as long as she isn't suffering...what did the Vet say? did the Vet think she was in pain? you have to go by what they are telling you for its real hard for us to comment on when we can't see her.....
read through all the posts on this link...I don't think any of the original posters are on Medhelp any longer so they won't be giving you a reply. I have heard back from some of the later ones weeks later that stated their kitties improved...but it takes weeks to happen. do what you think is in kitty best interests hon.
click on the link below and read all the posts, some are old...but you can still gain some insight from them. best of luck and keep us updated ask more questions anytime and we'll try and help♥
http://www.medhelp.org/posts/Cats/Kitten-brain-damage--PLEASE-HELP/show/1303919