Ok so that cat I the picture I sent is a Turkish Angora cat and hopefully if I'm correct your kitten should grow into a beautiful cat like this!
I'm not that good I just know my cat breeds too well! XD
Because this is so sudden and I gather that she is usually a sweet calm cat then she might be hurt or in pain and doesn't really know what too do. This happened with my cat, he had a nice collar on and it was tightened correctly with it being able to fit 3 fingers in between it and his throat...
He could be anything really as he is a bicoloured cat and they are common in many breeds. His specific bicolour is Seychellois Septieme I believe. He does have signs of Bombay though with the pointed ears and face. If one parents was a Bombay then the over must have had some white on them so I...