I agree with Barbara, stop playing with her immediately and try the water bottle. I have a senior cat Tucker, she is 17 years old and you can be petting her and all of a sudden she will claw the day lights out of your hand. I know that it's her way of saying.....I don't like that anymore, but I have never had her just attack for no apparent reason.

I also agree that there is no such thing as a vicious kitty, I think something triggers Sara to attack but unfortunately it may be nothing that you see or hear.

Good luck with Sara.

P.S. I think Sara has beautiful markings. She is so pretty.