the decision is mine

a week ago my cat is infected with a fever, so i took her to the vet.....
i didnt think anything about the fever...it is an ordinary fever right...
anyway as the day progresses i realize something was wrong....
however i could get her to any medical attention due to the holidays in which the vet was closed...
finally when i took her, i left the her there under the attention of the vet...
on saturday, the vet called saying that the cat has seizures...that is one of the bad sign....
so today i went to visit the cat and man...the cat was in horrible shape....she couldnt walk properly...i quote what the vet said... "she walks as if she is drunk"....and she couldnt see anymore..
the vet then said to me...i should take her home and tried to give her time to recover....if she didnt show any improvement, well i have to decide on that....so...what should i do??
can u just say to people.." i leave the right to kill in your hands"...
that is so mess up....