Cat either got paralyzed or? Plz help?

From yesterday could not walk her back legs weren’t working properly and slowly she was not being able to move her head as well…..she want eating anything I was about to take her to the DOC but before that she died……any idea what could have happened to her I just need to know Because I am feeling to bad that I did not took took her to the doc before bcz I wasn’t aware of it so I just need to know if you have any idea what these symptoms are of If paralysis then what are the causes of it plz let me know.